yeah, processing is amazing for quickly rigging up flashy looking stuff 
... I think without it I would still be programming, but I would not actually consider it fun 
btw. I was just thinking - have you looked into using the Arduino UNO? As far as I have heard, you can get it recognized as a usb device - so you wouldn't need to fool around with the whole ps2 stuff...
Hm. And I am really curious on how the glue does. Keep us updated
cheers
p.