To make this a bit more on-topic for HN: http://www.cigarasylum.com/vb/showthread.php?t=45932

The above describes creating a bread-machine "Coretto" roaster. (I still have no idea why it's named that). A heat gun (for paint drying) from Harbor Freight (~$15, it's almost always on sale) is used for the heat. The bread machine is torn apart so it permanently spins, and never turns on the heating element.

After using it manually a bit you'll get the bug too. Eventually you'll want to control it electronically. I still have to actually do it...

That's really cool, thanks for those links. You've given me something to look into for the next side project!