Thank you to Evgeny who contacted me with a link to someone who has done this before! Here is the wiring diagram:
http://www.olimex.com/dev/images/AVR...CD-128-sch.gif
And here is a programming example:
http://www.olimex.com/dev/soft/avr/A...28CAN-test.zip
(Also, again, this is not my code, but it is on Olimex, and is therefore public domain). Happy hacking!