Heh, the more I think about it, the less practical it would be to put Linux on my PSP and get a keyboard for it now that I have an Eee PC. I thought it'd be cool before, but now it would just be completely impractical. I mean, yeah, it'd be pretty cool to use a PSP as an OS, but seeing how it only has a 333MHz processor, 32MB of RAM, less than 50MB total internal storage, and only 1 USB port, it seems unreasonable. Aside from playing games, there's nothing my PSP can do that my Eee can't.
That said, I still think Linux on a PSP is a cool idea. No idea why.