Originally posted by FlippySeal
Cool! Could i play MP3s on it and watch quicktime and Windows files on it?? *hopes* 
No but sony cant watch quicktime or wmv either and their mp3 support requires you to buy one of their ridiculously priced memory sticks.
Seriously for like 256 its like 100 dollars.
I dont really worry about mps playback though cause I have an iPod.

Oh yeah If you really wanna watch movies on it you could always buy one of those flash rom cartiges there are some that suport avi and divx playback on the gba.
And the ds is going to be backwards compatable to the gba.
Not sure but I think they support mp3, wav, and ogg playback as well...