Oh my, this is probably the neatest thing I've seen this year. Introducing, the pixelroller: "PixelRoller is a paint roller that paints pixels, designed as a rapid response printing tool specifically to print digital information such as imagery or text onto a great range of surfaces" created by Stuart Wood and Florian Ortkrass.
Watch the film as they paint a face onto the wall. Neat-o! If this ever hits the market I'll be changing my wallpaper every day, and as Beadesigngroup predicts I too suspect the amount of streetart-stencils will skyrocket. ;)

How long do you think until this is used as a way to dispense ads all over the streets?

Via Be A Design Group