Hello everyone here's a Darius build I made. :) Darius is a melee AD carry. In this build, I made him more tanky but still strong enough to kill on his own.
This is the best build evar!! I'm not saying this is the best build but it works well for me. xD

Pros Hard to kill late game High damage Great Apprehend skill Doesn't need much damage items because of Hemorrhage Noxian Guillotine perfect for KS-ing :D

Cons Squishy early game Doesn't have a good CC skill Long cooldown for Apprehend (If enemy target didn't die from Noxian Guillotine) Long cooldown for Noxian Guillotine

For runes, I recommend flat AD marks*, armor seals, magic resist glyphs, and MS quintessences*.

Basically it's R>Q>W>E just take 1 point for Apprehend at lvl 2.

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Normally I use Boots+ Health Potions because movement speed allows me to harass and escape from early ganks but when facing annoying enemies like Singed or Teemo, taking Regrowth Pendant helps sustain from the poison while Cloth Armor+ Health Potions allows you to farm easier during lane.

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These items help you sustain in lane early game and gain extra gold every 10 seconds. For me this is needed for Darius to farm faster than most enemies allowing him to buy mid-late game items faster. Sight wards are also needed to avoid ganks and counter enemies.

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Trinity Force helps darius in terms of attack speed, movement speed, attack damage, health, mana, and critical strike chances. With a bonus of 20% of slowing enemies, it is definitely a must have for darius. Sunfire Aegis and Force of Nature combined keeps darius from dying in an instant. The armor, magic resist, HP, and HP regeneration and a bonus of 40 magic damage per second allows Darius to help teammates and survive team fights.

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Early game try to harass your opponent on top using Decimate so that it is easier for your jungler to gank on the top lane. Darius' Apprehend skill also makes is easier for the jungler to gank even at lvl 2. Always buy at least 1 sight ward to keep the top lane safe from ganks. Also, don't push the lane too far, just last hit creeps otherwise your enemy jungler will have an advantage when ganking.
Try pulling 1-2 enemy heroes using Apprehend so your team can single out 1-2 heroes. Apprehend can also be used to stop ultimates like Nunu & Willump's but be careful if you hooked Nunu & Willump before he uses his ultimate. He might start channeling his ultimate and thus initiating the team fight. Having Darius pull one enemy makes it easier for your team to push a lane. Darius's Ultimate can be used to kill all your enemies so make sure to only use Noxian Guillotine when the enemy will surely die from it. Sometimes when you know your already gonna die and your enemy is low on HP and you've already maxed the stacks for Hemorrhage, you may use Noxian Guillotine, die and wait until your enemy dies from hemorrhage. :)
Darius is strong enough to tank in team fights and can initiate team fights by catching people off guard. Try focusing on enemy carries and Apprehend anyone who tries to go near your carries. Don't forget to use Exhaust on AD carries and focus them immediately.

Well here the end of my build. Please leave your comments, suggestions and vote up. :)

6/22/12:Created Guide
8/18/12:Changed masteries to 9/21/0; Changed runes to AD/armor/MR/MS; Added Ignite on summoner spells; Placed (*) marks on changes; Learned that a.s.s is censored xD