Get the following games in no particular order:
1. Lumines I and/or II (Great Puzzle Game, think Tetris but a million times prettier and with great music)
2. Every Extend Extra (Really cool and different shoot 'em up with great multiplayer)
3. Gunpey (Great puzzle game as well)
4. Exit (Really good side scrolling platformer/puzzle solver)
5. Metal Gear Solid Portable Ops
6. Tekken 5: Dark Resurrection
7. Valkyrie Profile: Lenneth (Side Scrolling old school RPG from PS1 remade that has a very different combat system than most)
8. Daxter (Great platformer)
9. Gitaroo Man Lives (Cool rythm game with a very weird charm)
10. Ratchet and Clank: Size Matters (Action/Platformer)
11. Locoroco (Side scrolling adventure game for the family)
12. Monster Hunter: Freedom (Great portable Action RPG)
13. Metal Gear Acid 1 and/or 2 (Turn based strategy in the MGS universe)
14. Princess Crown (Import) (Really cool side scrolling action RPG)
15. DJ Max portable 1 and 2 (Import) (Great DJ/rythm/music game from korea)
16. Crush (very good puzzle platformer that is very challenging as well)
17. Puzzle Quest (Puzzle RPG)
Only one of those is a PS2 port.
Also so many PSP games to look forward to in the future that look stunning: God Of War, FF: Crisis Core, FF: Dissidia, Silent Hill Origins, Monster Hunter Freedom 2, Jeann D'Arc, FF Tactics, Parappa the Rapper, FF I and II, Castlevania Dracula X Chronicles...
Thanks to Blacksaber for the sig!
