Some links that have turned up while doing research:
Musings on the usefulness of inkjet printers for a variety of applications. So ok, I’m not the only one who’s been thinking about this, but here I hope to actually do something about it!
Anders is playing with EMC2 and RepRap functionality as well. I’ve experimented with some of his temperature control ideas already, but need to work at the PID tuning a lot more.