For now there's really nothing interesting announced for the system, and from what I've seen the thing is actually HUGE compared to the PSP, which was already pretty big.... Like, there's no way it's gonna fit in your pocket. And frankly I see no chance of the console being reasonably priced for quite a while since, well, it's filled with awesomely powerful hardware, and that screen is pretty insane (OLED touch screens like that cost quite a bit to manufacture). The only thing that confuses me is that touch pad on the back of the console... it's so oddly placed, since it's where I'd usually rest my fingers while playing.
I'm sure it will eventually be good, it will just take time for devs to actually release good stuff on it, just like the PSP which basically had nothing for over a year. For now I'm not really interested, but I'll probably end up getting one once/if good games start coming out.
I can't wait until E3 though... I'm really hoping it's gonna be E3 '06 all over again... "The NGP will cost 499 US DOLLARS"