Here's a DPS (damage per second) calculator for the Warlock lot. It's from Ybrith of Rajaxx (EU) Horde and it's based from level 70 spells. It also includes nearly every factor for DPS.

You can input factors like duration of the fight, mana, health, spell damage, and build. Factors in combat are also changeable settings. It's pretty nifty if you're comparing builds (Affiction, Demonology, Destruction, or Demonic Sacrifice-builds) in terms of damage. This number cruncher can't calculate mana efficiency and doesn't include pet damage though.

But we're sure that warlocks (or players thinking of building warlocks) would find this relatively useful. You can click the link below to try it out.