Jeanne D' Arc
Brave Story New Traveler
Tales of Eternia
Final FantasyI Anniversary
Breath of Fire III
Tekken Dark Resurrection
Guilty Gear XX/Judgment
Street Fighter Alpha 3 Max
Darkstalkers Chronicles Chaos Tower
GTA Liberty City Stories
GTA Vice City Stories
Daxter
Ratchet and Clank **** Matters
Megaman Maverick Hunter X
Monster Hunter Freedom 2

Brave Story New Traveler is good too.

But in terms of genre, I cannot state any one game which represents the best in the PSP library:

RPG
Brave Story New Traveler

Strategy-RPG
Jeanne D' Arc

Adventure
Ratchet and Clank ****Matters

Fighting
Tekken Dark Resurrection

Racing
Ridge Racer 2

Puzzle
LocoRoco

Action
Grand Theft Auto Liberty City Stories

Stealth
Metal Gear Solid Portable Ops

If you have a friend who has a PS3 and has purchased a game from the PSN, than he/she will have 4 additional copies of the game, which can be yes, transferred to your PSP.

Along with that, yes, PSN will be coming to the PCs soon.

Disgaea Hour of Darkness

....nough said....

Alot of people still dont know what this game is:

Tales of Symphonia

Yes and No.

It started out strong, but became weak near end.

Its good because of the 1st party games, but due to its lack of third party software, it crumbled due to the heavy influence of the Playstation 2.

My favorite character was Link

Sonic Adventure 2: BattleRocky32189

wow, thats one of my most favs.

I would say my least favorite one was Star Fox Assault, its good though, but bottom of my list.