no motion controls, better screen, slightly less battery charge (about 20 minutes I believe), bit smaller, and a mic are the differences I believe. and the background is random, you can change it to a different color if you want or download a different theme. what games did you get with it? I would suggest GoW:CoO, it isn't the best GoW game, but it is the best on psp. Daxter is also fun though the controls gets some getting used to, CC:FF7 is hit or miss but if you liked FF7 you should get it.
edit: I see from your games list you got Castlevania, I have heard some good things about it. Haven't heard much of the other games you got though, or heard of them at all.