We have alot to thank Sony for in fairness for tackling the handheld market. It gave Nintendo a much needed kick up the arse. Handheld gaming didnt interest me at all before the DS but Sony entering the market with an ambituous plan made Nintendo innovate to try and hold onto all their game boy customers and add a few new ones.
PSP is flawed but it has some interesting games. MGS portable ops is making me consider one alone, Pro Evo 6 is supposed to be good. The redesigned and cheaper psp may well be worth getting, especially if they throw in a 2 or 4GB card with it.