LOL, Bluefront has already given you the link to the thread in RFD... cheers, mate!
I have the MEGA 651, but I'm not a adventurer/modding person, so I didn't change much in the current setup, besides tidying up the wires a bit, to allow for more cooling (I have a 9600 Pro). Bluefront has done quite a lot of modding, he'll fix you up with any info you need.
BTW, I'm running one of these Mobile Celeron processors, as seen in this thread:
http://forums.anandtech.com/messageview.aspx?catid=28&threadid=1527123
Except that I didn't modify the CPU at all, not even the "bent pin" trick... and it works just fine.
I'm really pleased with the little computer, and would recommend it to anyone who wants a SFF.