Circuit stickers, referred by Betty Barrett:
Ink-jet based circuits, referred by Dean Rose:
Jeff posted a note about the interesting prototyping work coming out of GSLIS.
In a similar vein, check out a similar prototyping concept from IDEO lab: a video prototype for iphone app which takes it to the next level.
What you want to see is the "secret".
Shouldn't we have a collection of these?
Dean Rose and several Fab Lab volunteers will be attending the UI research park Prototyping Fair tomorrow - go check it out!
I'm enrolled in a coursera class on HCI to help expand my resources for teaching and found this video on rapid prototyping and the design process that I thought was quite relevant to our lab: