ipod touch has lots of games too, touch sensitive ones like the ds..
psp is overrated, mostly all of its games are remakes from ps1/ps2, the only thing that made me justify my purchase of one was the game called Patapon..
imo ds > psp.. but of course i know you like a music player too, even though psp/ds can play mp3s, ipods are better because they're dedicated to that..
and lastly ipod touch has lots of apps outside the scope of gaming.. like i told in the previous thread, it has a metronome app.. and also you get YM, Skype, Facebook, etc. if you're into social networking..
so ipod touch +1 for me
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