A lot of the PSP games will be ports of existing PS2 games. But would you want to buy say, 2 copies of GT4, one for PS2, one for PSP?
Because the PSP is capable of PS2-quality graphics, users will expect more from the console and it could be very expensive to make new games for it. Also, although the PSP has wonderful tech specs, its otherwise rather boring. Nintendo have really thought out some interesting ideas for gameplay.
On the other hand, I think that the DS will have a reputation as a kiddies machine and Nintendo are effectively cutting off a large section of the over-18 market.
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