I found this awesome listing of powers.. over 400 of them, and even quite a few link into each other. This would be great if your stuck on an ability for your characters because it will show what ones are related and describe what each ability is.

http://theories.activatingevolution.org/sw...til=Lancination

Also, another pretty good site is the one below, it has some repeats of the one above, but you can look here for some the other may have that are different.

http://www.superherodb.com/powers.php