I love PSP hackers. They may be able to run homebrew code by uploading huge wallpaper images with a wee bit of code attached. The images are too big, there's an overflow, and the PSP executes the overflow. Now, first off, this entire process sounds as arcane and exciting as making special monkey brain sausage AND second off it means that someone out there sat down and said "Hmmm... So I'll make a really big PSP wallpaper and embed byte code in it. Just for kicks. You know, because I'm not dating anyone right now."
PSP Haxors—we salute you.
2.0 Overflow Found and Working [PSPUpdates]