Seems that you can also use the old Xbox controller to port over with PSGroove. Although, it sounds silly but it still possible and a lot more cheaper if you have one already. Maybe you can play around with it, set up the dev environment and compiled it or wait with the dev boards. But, the idea of using Xbox thing to PSGrooved PS3 console is really sounds exciting!
Most of you should already know this trick, but there are still a lot of newbies out there that still haven't got a clue to access PSN back on 3.55 firmware