The Skill Calculator is now live on the Diablo 3 website.
With it you can map out the Active Skills for your Barbarian, Demon Hunter, Monk, Witch Doctor or Wizard hero.
A separate page details all of the Passive Skills you can assign to your hero.
The point is to test various hero builds before committing to them in-game. But what this also means is that all of the Diablo 3 character skills and their properties can now be viewed online.