Free WoW Guide: Rogue build: DoT Rogue

Assassination Talents (23 points)
Improved Eviscerate - 3/3 points
Malice - 5/5 points
Murder - 2/2 points
Lethality - 5/5 points
Vile Poisons - 5/5 points
Cold Blood - 1/1 point
Improved Deadly Poison - 2/5 points

Combat Talents (2 points)
Improved Sinister Strike - 2/2 points

Subtlety Talents (26 points)
Master of Deception - 5/5 points
Opportunity - 5/5 points
Elusiveness - 5/5 points
Improved Garrote - 2/2 points
Initiative - 5/5 points
Improved Rupture - 3/3 points
Hemorrhage - 1/1 point

This might not seem like it, but it’s a very high damage build. DoTs completely ignore armor values and are therefore extremely deadly against high armor foes (such as the high level instances). Garrote and Rupture are affected by Hemorrhage, which is a good thing. If you have Garrote, Hemorrhage, 5x Deadly Poison and a 5pt Rupture (which isn’t easy but is doable) you’re doing 430dmg/3secs (which is how DoTs are calculated). And it’s not counting critical hits from Garrote and Rupture. If you don’t find the need for Sinister Strike, you can always drop it and put the 2 extra points into Improved Deadly Poison for a 42% chance of applying the poison, which nearly guarantees 5 stacks all the time with daggers equipped.