Sheeez - a month since my last post. That's pretty poor; I'll try harder from now on ;)
Anyway, check out the GP2X, which is a handheld console-type device that runs Linux. It does all the usual PSP-style stuff, but with Open Source goodness. If you're a hardcore gamer (I'm not) then it's maybe not for you, as the latest titles are not developed for the GP2X platform, but if you have any other interest, I'd say it's worth a look.