I just finished the second installment of the Phoenix Wright: Ace Attorney series for Nintendo DS, and I had to write to say how amazing I think it is.
It's even more fun than the first one, more exciting, and more amusing (and I thought the first one was great). They expanded on the game's system to make solving the crimes even more exciting.
If you have never played or heard of Phoenix Wright, now is a great time to start; the third installment was recently released in the US. I'm waiting for my boyfriend to finish so I can borrow his. :3
PW is a "visual novel" type game. It is mostly text based. As a defense attorney, you have to defend your clients, scouring for clues and presenting evidence to prove them innocent. If you like solving mysteries, figuring out puzzles, and/or participating in an interesting and engaging story with a wealth of great characters, you will like this game.
I'd like to cosplay as Franziska von Karma some day. She's sassy as hell.