Hello Everyone!
Im going to Try to make this guide as possible detailed about Irelia to The Speed of Sonido :D
With this guide we focus on lvl up early the first skill Bladesurge + Sheen
and we become Burst dmg just like Akali
Also I based on the guide of DEWO u can look at Here

He give me the Idea and I make a few changes so, Basicaly this guide was started by Dewo.
Regards to him and thanks for this!

Update 04/02/11
Defensive Way, because Irelia still rampage with more Defense

ps: My english sometimes is terrible, so please forgive me, for my grammar mistakes :(

Proz:
- You kill with your mind
- Good farmer/laner
- You can take Solo Lane or Mid
- Deceptively strong burst
- Great chasing/juking abilities
- At mid game u can harassing range Heros and make them b
- Awesome Ganker and Early start
- We got a skill that make us usefull for the team like Equilibrium Strike
- HUGE range of Attack !
- I like the natural mana regen.


Cons:
- If ur lane have control on you, is going to be very hard to get these expensive items.
- Skill/micro intensive
- Requires good judgment/awareness
- No for beginners

Greater Mark of DesolationGreater Quintessence of Desolation With this combination we got a lot of Advantage in damage.

For the survivability, because sometimes you get focused for everything including meele. Btw we have just 8 runes because the last 9 doesnt work , we wont get the bonus dodge for that rune, anyways if u change it for MResist is going to cap with blue ones for 1+ extra point of mresist, better than nothing ;p

Again For the survivability, Some people take Greater Glyph of Cooldown Reduction, but you really don't need CDR when you have blue buff.

Masteries
I go 21/09/0
Because sinergy with our game play style and runes.

Exhaust and Flash
- Our Summoner Spells Are Very important for our Play Style because both improve our attack range/duration and they perfect sinergy with our skills
- Flash also give you that little jump on the ganks, it can counter enemy flashes, and can even get you out of anywhere.


- Anyways in some cases like many exhaust,cc enemys Cleanse is a good option

If i have to say our core item, is always:
Mercury's Treads + Trinity Force

I Highly recommend you to start with:
Sapphire Crystal and 2 Health Potion
Because with more mana we can harass and last hit with Bladesurge more and thats why I love the natural mana regen because we dont need to go back to base and health till mid game sometimes.

After that if u r playing like I think u must have enough gold for Boots and Sheen If im correct u r going to do huge damage but you must need follow the skills combination order for better results.

After a few ganks or farm I get Zeal because we got full rise of damage

Now finish ur Trinity Force

After all this, if the game continues, just go for infinite edge or any help for that situation, if u dont know anything about that keep reading.

Boots
Mercury's Treads: Is my main option because sinergy with our passive Ionian Fervor and also with our runes Greater Glyph of Magic Resist and of corse there always a CC in a good team. a Good choice vs a serious game or ranked.

Sorcerer's Shoes: As DEWO Said:
You do see it right. You might say "this is an AD/AS build", that is true, but...
Equilibrium Strike deals magic damage.
Transcendent Blades deals magic damage.
For Bladesurge that deals physical damage you have ArP Marks and Quits.
a Good choice If u are alrdy feed.


Only these boots I recommend.

Offensive items
Infinity Edge: If u got feed, or they r too many squishy run for this

My Defensive Way
sunfirecape & Randuin's Omen: vs physical damage - Because with this we got High HP no for tank, sor survive and of corse thats mean more constant damage

Aegis of the Legion & Banshee's Veil: vs Magic Damage and the same idea