I just bought a conductive ink pen from the Bare Conductive booth and am looking forward to drawing some paper and cardboard circuits when I get back. The Bare Conductive folk have a great collection of painted touch sensitive circuits to play with.
Shawn Wallace is a MAKE contributor, artist, programmer, and editor living in Providence, R.I. He designs open hardware kits at Modern Device and organized the Fab Academy at the Providence Fab Lab. He makes iPhone synthesizers with the Fluxama collective and is a member of the SMT Computing Society.