Casinowhoring.com is okay, but it leaves out a lot. This post shows you how to get an extra $150 on your first 3 casinos.

When branching out beyond those three, casinowhoring is a good start, but it's known to be slow to update. In particular it has incorrect info about the Fortune Lounge group, which is basically no longer whorable. (Okay, it is, but there are much better ones out there.)

The best resource is the bonuswhores.com forums. Search around there for info about just about every casino.