For me the main thing is definately the games, I play a lot of PSX classics like the final fantasy series, aswell as SNES and GB roms. The PSP form factor and controls make it absolutely perfect for the job, as I would never play those games any more at home on the big screen, but it's good to have with me on the train or something playing some classics!
There's a bunch of stuff you can do with it if you keep your ear to the scene, I used to use mine as a remote control for my TV when mine packed in for example.









