I'm pretty pissed off at Microsoft right now....

[squeeforever]

Basically, I have my PSP enabled to play NES, SNES, N64, Playstation, Genesis, GB, GBA, GBC, etc. Pretty much any game except PS2, PS3, Xbox, Xbox 360 (all the new, more powerful systems). ISO's are basically a format games are often put in, such as PSP games on the UMD's. People figured out a way, using custom firmware, to rip the games from the UMD, to the memory card, or PC, through the USB port. That way you can make a "backup" of them. You can download them if you find the right sites. So basically, I can just put the PSP ISO on my memory card and don't have to have the game itself.