Here is my try with Nocturne. I'm not telling you guys how to play him the best way, just mine :) I'm sorry for my bad english!
FEEL FREE TO ADD ME INGAME: Nithrai

AA = Auto-attack (Basic Attacks)
CC = Crowd Control (Stun, fear, slow, snare, etc)
FB = First Blood
AP = Ability Power
AD = Attack Damage
MD = Magic Damage
AS = Attack Speed
MS = Movement Speed
MR = Magic Resistance
ArPen = Armor Penetration
MPen = Magic Penetration
LS = Life Steal
SV = Spell Vamp
DPS = Damage per seconds aka Damage
MDPS = Strong spells; casters
CDR = Cooldown Reduction
OOM = Out of Mana
MP = Mana
HP = Health
MP Regen = Mana Regeneration per 5 seconds
HP Regen = Health Regeneration per 5 seconds

LORE

Before Nocturne, people believed that dreams were figments of their imagination, meaningless images that flashed through the mind when one slept. This belief was put to the test when a rash of sleep-related incidents started afflicting summoners of the League. Some would wake up screaming, terrified and beyond consolation. Some could not fall asleep, slowly going mad as the nights ticked by. Some simply never woke up. Physicians were baffled until a Field Architect happened to pass out next to a nexus on Twisted Treeline. Witnesses said he cried out once and then stopped breathing. Immediately after, magical energy arced out from the nexus, and Nocturne appeared.

Nocturne did not take his introduction to this world kindly. He slaughtered everything he could find before summoners were able to magically confine him. After a period of intense study, League experts divined that Nocturne hunted summoners in their sleep, attacking them in a place where their magic was useless. This seemed to be his only purpose. The families of the victims demanded justice, but League officials were concerned that death might only return Nocturne to the place from which he came. They bound him to a nexus fragment, trapping him in the physical world. As punishment for his crimes, they allowed summoners to call upon Nocturne in the League matches, bending his will to the summoners he hates and creating his own personal nightmare. League scholars don't know whether he truly came from the plane of dreams, or whether there are any more like him. Some theorize that the summoning act affected summoners' subconscious minds, luring Nocturne to them in their sleep. Perhaps the most disturbing theory is that Nocturne is a person's nightmare come to life. If this is true, they wonder, who is the dreamer?



Pros:

- Massive DPS
- Good Jungling ability
- Very good killing Machine
- Good surviver

Conse:

- You don't want to get target
- You don't want a Mana depended hero
- You don't want Nightmares after you played him
- You don't have 6300 ip

Cost: 6300 IP or 975

:Passive
Every 10 seconds, Nocturne's next attack strikes surrounding enemies for physical damage and heals himself for each target hit. Nocturne's physical attacks reduce this cooldown by 1 second.

:"Q"
Nocturne throws a shadow blade which deals damage, leaves a Dusk Trail, and causes champions to leave a Dusk Trail. While on the trail, Nocturne ignores unit collision and has increased Movement Speed and Attack Damage.

Cost: 60 / 65 / 70 / 75 / 80 mana
Physical Damage: 60 / 110 / 160 / 210 / 260 (+0.75 per bonus attack damage)
Movement Speed Bonus: 15 / 20 / 25 / 30 / 35%
Attack Damage Bonus: 20 / 30 / 40 / 50 / 60
Cooldown: 10 seconds

:"W"
Nocturne empowers his blades, passively gaining attack speed. Activating Shroud of Darkness allows Nocturne to fade into the shadows, creating a magical barrier which blocks a single enemy spell and doubles his passive attack speed if successful.

Cost: 50 mana
Cooldown: 20 / 18 / 16 / 14 / 12 seconds
Passive Attack Speed Bonus: 20 / 25 / 30 / 35 / 40%

:"E"
Nocturne plants a nightmare into his target's mind, dealing damage each second and fearing the target if they do not get out of range by the end of the duration.

Cost: 60 / 65 / 70 / 75 / 80 mana
Cooldown: 15 / 14 / 13 / 12 / 11 seconds
Total Magic Damage: 50 / 100 / 150 / 200 / 250 (+1.0 per ability power)

:"R" ULTIMATE
Nocturne reduces the sight radius of all enemy champions and removes their ally vision in the process. He can then launch himself at a nearby enemy champion.

Cost: 100 mana
Cooldown: 160 / 130 / 100 seconds
Physical Damage: 150 / 300 / 450 (+1.2 per bonus attack damage)
Range: 2500 / 3250 / 4000

Greater Mark of Desolation Greater Quintessence of Desolation

Greater Mark of Desolation: I use for getting more armor-penetration
: I use because I jungle, so that will give a bonus at the start
: I use because of his Umbra Blades which gives a AOE attack to near by enemies. because everytime Nocturne hit with Melee, will the cooldown of 10 seconds, fall with 1 second. and that is good for your jungling due to that when you do the AOE hit you heal yourself due to how many creeps/champions get hitted.
Is also a good choice due to that his a very mana depended hero.
Greater Quintessence of Desolation: I use for getting more armor-penetration.

I use or So i can hunt people down if they are escaping

And then ofcouse .


If you are laning with him, which you also can use my Build for with small changes LOOK "ITEMS"

Summoner Spells:

Exhaust
/
Ignite
And
Ghost
/
Flash

Hei Guys, here i will tell short and simple about to jungle.


As you can see I start with the Blue Golem Buff, which is hard for Nocturne to start out with.
So I always use my teammates here. The on that are in mid lane are Scouting, on the other side of the brushes, after the 1,55 min, you let him just do 1 melee/ranged attack so he will get that angro.

This tac also work at the Lizard (redbuff) which you can start with too, i just like start with blue due to that Nocturne's CD's are very high in the start.
While the Golem are running around, you just do all the damage you can do to him, and then when his starting to hit you, Use 1 Health Potion and then use Smite when the Golem are at 450 Health.

After you Killed all the Creeps in your forest, Then you have around 680-700 gold. IF not go to the solo lane and get that.

Then you Can start in the enemies Forest, totaly the same way.


BUT BE CAREFULL You have to have your vision on your map/chat for the Missing.

And remember to put out some ganks. It os so important that you are ready to pull out ganks, because it will turn the game!

-NOTE: You can use this skill order for ganking

+ (If you are about to go after a hero that can slow/Stun/fear etc you)+

Easier Jungling way after suggestions
The red lines show when i normaly start to put out a gank, or try to!

GOOD LUCK !

Creeps Information

The Wolves:

*Respawn in 100 seconds

Big Wolf:

*Gold: 25
*Experience: 90

Wolves:

*Gold: 16
*Experience: 50

Two Golems:

*Respawn in 100 seconds.

*Gold: 30
*Experience: 140

The Ghost

*Respawn in 100 seconds

Ghost (Big):

*Gold: 35
*Experience: 120

Ghost (small):

*Gold: 12
*Experience: 20

Golem and two Young Lizards:

*Initial Spawn Time: 1:55
*Respawn Time: 5:00

Ancient Golem:

*This unit regens 1.5% mana (or energy) per second and has (16 + Level*0.5)% cooldown reduction on their abilities. If slain, this buff transfers to the killer.

*Duration: 2:30
*Gold: 60
*Experience: 220

Small Lizards:

*Gold: 10
*Experience: 30

Lizard Elder and two Young Lizards:

*Initial Spawn Time: 1:55
*Respawn Time: 5:00

Lizard Elder:

*This unit's physical attacks slow the target's movement speed and deal damage based on their level. If the buff holder is slain, this buff is transferred to their killer. Also slow the target

*Duration: 2:30
*Gold: 60
*Experience: 200

Young Lizards:

*Gold: 10
*Experience: 30

Dragon:

Initial Spawn Time: 2:30
Respawn Time: 6:00
*Gold: 190
*Experience: 900

*Gives global 190 gold to the killing team, as well as 25 gold and additional experience to the killer and nearby allies.

Baron Nashor:

*Initial Spawn Time: 15:00
*Respawn Time: 7:00
*Gold: 250
*Experience: 900

Well I use the Item Build i already set up at the top.

I never use those boots there stand in other guides! ALWAYS see which champions you are going to fight with

Use agaisnt Lot of AP/CC Champs
Use against Champs like Soraka Teemo etc?
Use against lot of melee dmg like Jax Tryndamere etc?
Use if you like to run fast.
Use if you are totaly ******ed

BUT! :D !!!

You can take out 1 of the or
With a which is one of my fav Items.

You can also Change The With a But you have to sell it late game, and maybe get a or
after what you like :).


Items which you can try to put in. (If you like AS!)



Or (if you want more hp and few dmg)



Or (if you want to nuke fast but die easy)




For the lane Version

is a good choice to pick as the first item before the Trinity Force
MORE TO COME!

My own

Friends


If you guys have a good game with my build, plz take a Screenshot of your match-history and link it to me in a comment
note: Use Tinypic.com

First Tip:

Nocturne's Shroud of Darkness is really helpful, he can avoid ANY! spell. yes that sounds crasy but it's true, the timig just have to be there:D But i don't know yet if it works against, Gragas Ultiate, that knocks you back. but i will find out soon

More will Come!

16/3-2011:

Build Created

17/3-2011:

Added Jungling Guide and Items Suggestions
Added More to information to the Jungle part
Added Lane Build, and more information about the items
Added More Runes Suggestions

19/3-2011

Added new item's/change build to "Jungle"
Added New and easier Jungle Road

I will Update the Build/Guide When I see new ways to play Nocturne.




Feel free to leave a comment, and ofc remember to vote up if you like my Way

GOOD BYE :D