ScreenGoo is a paint-on movie screen compound that can turn any wall into a screen:
Screen Goo is a specially formatted, highly reflective acrylic paint, designed specifically for the video projection industry. Screen Goo acrylic paint allows one to transform any smooth paintable surface into a high performance projection screen.
(via Red Ferret Journal)
Update: Fred sez, "Sony has created a new black screen material that rejects ambient light other than red, green, blue. This means that the Achilles heel of front projectors — rejection of ambient light — may soon be eliminated. So before you go painting your room in reflective acrylic or blow dough on a plasma screen, you might want to wait until this hits the market. I'm guessing that within a year, you'll have 3 lb. DVD-quality projectors for sub-$1k capable of throwing 90in images onto your hot new roll-up black screen. The TV-in-a-box could well start disappearing from the American living room by decade's end if this technology works out."
