I don't think this has been posted before, so hopefully it isn't. Anyways their is a site that has released an eloader that works through GTA:LCS. You load the game, then load the eloader as a save file. It then brings up a menu for other apps to run. Currently about 65% of homebrew should work with the eloader. I have been playing snes roms lately and lovin it. The psp is a wonderful device for emulation. Here is the link
Eloader Link
Eloader Link