[ilya]

Yes, you can play any GBA game on the DS. So, for example, Golden Sun will work just fine. You don't have to buy any extra equipment...there are simply two cartridge slots on the DS, one for DS games and one for GBA games. The system comes with a protective blank cartridge to prevent the GBA slot from gathering dust.

The screens are smaller than the PSP's, but then again there are two of them. And most games do use both. Either way, the screen doesn't feel small when you're playing a game. You also don't have to worry about your screens getting scratched up, as the clamshell case snaps up neatly and protects both of them. not so with the PSP.