True to their word, Mathieulh and the crew have released a open-source implementation of the PS Jailbreak exploit, coined PSGroove. The software is compatible with AT90USB and related microcontrollers. Grab a Teensy USB development board and you'll be all set.
It's worth noting that the PS Groove code is not a 1:1 copy of PS Jailbreak's take, as it lacks support for running backups[...]
Continue reading: PSGroove Released, Open Source PS Jailbreak...