ViRGE
Elite Member, Moderator Emeritus
http://www.gamefaqs.com/pspThe Sony PSP isn't really a flop. It's by far the most successful gaming handheld not designed by Nintendo. (And not desgined to be a phone...) Western developers aren't paying that much attention to the Nintendo DS either, so that doesn't mean much.
http://www.gamefaqs.com/ds
GameFAQs has upcoming games lists for the platforms they cover. The NA PSP list does not even go half a page, meanwhile the JP PSP list fills the page and only goes out 2 weeks. The NA DS list on the other hand is full for all regions. The timing is bad on this since with the 3DS coming out companies are winding down their DS releases, but I think it still illustrates my point. The PSP list has been barren like that for over 2 years.
It's the most successful non-Nintendo handheld ever, but it's really only a successful platform in Japan. The only notable English language releases over the last year and a half have come from Sony itself, and they only release a few games a year.