Counted today. 50 unique games, several of them traded for and/or gotten very cheap thanks to CAG. Having both Japanese and American Electroplanktons pushes it up to 51, and I have an extra copy of Metroid Pinball I won in a contest, so 52 total.
Several imports (Electroplankton, Chousouju Mecha, Daigasso! Band Brothers, Exclamation Warriors, Tingle's Rupeeland, Jump Superstars), lots of third party (Castlevanias, Phoenix Wrights), and most of the better first party games. A good mix. And there's still a dozen or more in my TL I need to pick up eventually...
I'm a packrat and tend to keep everything across all systems.
Most likely will pick up #53 tomorrow (Chibi Robo) and I'm debating on if I want to drop another $60 at TRU to get Drawn to Life + most likely 1-2 more DS games.