If you haven’t seen this yet, try it out.
It takes a little set-up but the result is very interesting. – an interactive 3D holographic effect.
http://ge.ecomagination.com/smartgrid/#/augmented_reality
It requires a web cam, a printer and Flash (sorry Jaqui)
I couldn’t get it to work in Firefox (probably a setting issue). It worked fine in IE 6 and 7.