If you happen to have an extra PSP lying around, here's something you can do with it: turn it into an extra monitor. Well, a status monitor for your PC, at least.
To be clear, this app from developer avi doesn't actually turn your psp into a secondary monitor. All it does is output your PC's status (CPU usage, CPU temp, etc.) onto the PSP screen. Still pretty cool if you have a PSP that you don't use anymore.
The PSP app itself is in Lua. The computer-side app is written in Python. Both are included in the download below.
Download: PSP as a status monitor