Wide View Hida, Pocket Type
I didn't know I wanted a Sony PSP until I read that Densha De Go, or Let's go by Train, the infamous Japanese train simulator, was being released for the platform. So you can play a train simulator on the train to work, if circular reference is your thing.
Reports from folks who've imported a copy are fairly positive.
Even so, I wasn't completely convinced until I saw the 3 part TV ad campaign. Utter perfection.
Incidentally, the titular Wide View Hida is a kind of Japanese EMU - it would be too hard to make things like that up.