I picked up a PSP just after it came out. Finally I got around and upgraded firmware on it. And now there is a web browser. The pairs mode of twexus runs nicely one it. 10 pixels get cut off, but that is fair enough for a website that I wrote three years ago. It actually looks decent. This is what my webserver says in the agent column:
Mozilla/4.0 (PSP (PlayStation Portable); 2.00)
when the PSP comes along.