Hmm, I stumbled across this thread and I really like the concept. Looks cheap as chips for basic prototyping but I was hoping to get a little more info about it before putting pen to paper..
I saw this on the DIY PCB mailing list. I'm definitely interested in it. The only issues I have is the equipment and baking process. Also, I can't see any way to align the board up well enough to do double sided.