I have Driver 76 for the PSP for those of you who care (I've had it since it came out). And across the map, there are 125 stars (so far, I found 124, so I'm almost there!) that you can collect (it's not manditory). These stars you can find in hidden areas, and some are suspended in the air. With each star you collect, you earn one collectable.
The collectables in Driver 76 are kind of dumb. You can only trade them in the multiplayer games. The collectables can be things like clothing, New York landmark trading cards, badges, key chains, paint, etc. But these don't do $#!+ for the player. You can't wear the clothes, you can't wear the badges or key chains, and so on and so forth. However, you can respray your rides with the paints you unlock. I would've loved to change my outfit in the game. A little mix and match isn't a bad thing. I sure hope you can change your character's appearance in the next Driver game.
Oh and one last thing. The thing about the customizable soundtracks in Driver 76 was a f**king lie. No, you can't upload your songs from your memory stick into the game. Even though the soundtrack is fine itself, you still can't upload your other favorites. Good thing that the next-gen Driver will be on the XBOX 360 and PS3 (hopefully). I have the 360, and I can upload ANY song I want in the world and have it play on the game, regardless if it has gameplay music or not.