I'm often sceptical about art using technology, having seen scarred by one too many ICA net.art exhibitions in the mid-nineties, but some folk do interesting stuff with electronics. Josh Rubin's ever fascinating Cool Hunting points out a nifty device created by Troika Studio "a collective of designers and artists" (who make it impossible to link to pages of their Flash-based site). Josh: "The SMS Guerilla Projector is a high powered, home made projection device that can be used to project SMS messages on to buildings, signs or any other surface." Like many good things it combines simple, easily-obtainable components into a whole that can do something new and interesting. I can well imagine such devices being used by protestors and also being commercialised as a fun gadget.