You can get about 2 games max on a 1 gig card i'll have a shifty indoors as i think i still have a few dvd's worth of games somewhere or you can just download them from the usual torrent places but most "new" games are around 1 gig in size now..

oh yeah just remembered this too hope it helps mate, it's a working list of games for your psp

http://forums.psphacks.net/index.php/topic,13528.0.html