Watson (good but short) Beauty Lawyer Victoria (haven't tried it) Those are just lawyer-themed adventure games; you also have the CSI games and Dexter that some of the same aspects of investigation, and more general adventure games like Broken Sword, Return to Mysterious Island, Hector, etc.
Well, that sums it up. Or go get a DS and get the rest of the Phoenix Wright games, along with Apollo Justice and Ace Attorney Investigations. And from what I've read, Beauty Lawyer Victoria is pretty crappy. I'll look more into it, but it doesn't seem half as good as the real game.