The Datel Lite Blue Tool looks to be the best option we've got at the moment for hacking the PSP 3000 (this model has proven a tough nut to crack.).
It's essentially a smart battery that clones Sony lab equipment to put the PSP 2000 and PSP 3000 into Service Mode. From this mode, users are approaching the PSP with the access of a Sony engineer and can load old, cracked firmware that's open to run homebrew.