DreaDNoughT has just released Hackers Vs Sony - a homebrew Demo game, a cute little game where hackers have to fight against the evil Sony minions until you get deeper into the Sony HQ and have an epic battle against the boss who made it so difficult to get homebrew on PSP, before Dark_AleX and so on came along...
To make this work on a 1.0 just do the following:
1. put this folder in the psp/game folder
2. copy all the folders in the "HVS 1" folder
3. fire it up on the PSP and enjoy