There is a good article discussing a simple AVR based ethernet device at http://tuxgraphics.org/electronics/200606/article06061.shtml
It seems like this controller could very easily be adapted to drive a RepRap machine. This would be an easy and relatively portable way to communicate with a RepRap machine.
Looking at the parts list, it appears it would cost $20-$30 USD for the device.
Just in case anyone is interested. :)
Long-term, yes. I also had a mad fantasy of making all the boards in RepRap (Version 5;
let's be realistic...) Bluetooth and just running power round the thing. Maybe not so