While I believe both handheld systems will have their fair share of GOOD games. I believe the DS will outsell the PSP b/c Nintendo has always created the best hand-held gaming systems. Why? They just have. WSC never released in America. Game Gear, whle popular for a short amount of time, was not successful. the DS is already outselling the PSP. To even bring in consoles such as the PS2, the Gamecube, the N64, or the PSX is rediculous. One flaw in a different system doesn't reflect the companies other systems.
Someone said their PSX always freezes, guess what, the console is very old now! Take better care of it, and it doesn't happen. I got my PS2 the christmas they came out, and I always lay it horizontally, it works perfectly still to this day. My friend's GC, it works wonderfully, and let's remember, that the GC is the most advanced system out there. It's graphic capabilities are the highest, however, the mini disc choice was the flaw that ruined the system's specs. GC has much more power than Xbox and PS2, as well as being more durable.

the ds will outsell the psp in quality and fanbase. Nintendo will always dominate the handheld market because, lets face it, their hand-helds are just better.