PSP Hackable
 

For a while if you had upgraded your PSP to the latest firmware version 3.50 you were unable to hack it. But now they have released a new downgrader enabling you again to put on your own custom firmware.

Welcome to a few weeks ago...haha just kidding. Ya it's a great ability to have for people who upgraded (or bought a psp) past firmware 3.10. The homebrew scene in the psp is among the coolest out there, imo.