JigglyWiggly said:DS is so hardware limited to do anything useful other just playing a game. It's not very innovative at all.
The idea of a games console is to play games. Besides, DS was (and still is) cheaper than the PSP. Honestly, I couldn't care less about the multimedia features of the PSP; stupid requirements for videos, and my MP3 player has way better sound reproduction for music and doesn't have stupid shoulder buttons that are incredibly sensitive and switch song when an ant jumps on them.
And "DS is not innovative". How many games consoles can you say make use of a touch screen? There is a few times where it's way better than the PSP in that regard (Metroid Prime: Hunters, mini games in Mario 64 DS, etc).
Also note the increased battery life of the DS.
Also, iirc, the DSi has an SD card slot, and older DSes could make use of the "R4" card for homebrew and stuff. A PSP and DS can do pretty much the same things; there's a browser for the DS, and plenty of homebrew media apps for it too, I'd expect.