Circuit stickers, referred by Betty Barrett:
Ink-jet based circuits, referred by Dean Rose:
http://www.nanotech-now.com/news.cgi?story_id=48475
See our Fab Lab specific introduction:
https://docs.google.com/document/d/1uNf4wywPpOuvX2R9s9NJ__6jj374ET6bk2Zu7eMDTQY/edit