Custom Firmware and Apps
If you’re the kind of person who likes to crack and customize your toys, the PSP might be a fun project for you.
While installing customized firmware and applications on your PSP will void your warranty and runs the slight risk of bricking it if done incorrectly, there’s a thriving mod community with sites like PSP Hacks and PSP Custom Firmware that provide you the tools and resources to install homebrew applications on your PSP.