Printers meant to be portable are usually not very much so. The fact that you must be able to feed an A4 sheet means it needs to at least be as large as the paper width. Well, watch the embedded video and be impressed by the PrintBrush which lets you sweep repeatedly across a piece of paper to create a printout.
Aside from being really small, this device is apparently silent so you can use it during meetings. It weighs 250g and prints in monochrome. Connecting it to a computer can be achieved via USB, Bluetooth or infrared devices. PrintDreams, the London-based company responsible for the PrintBrush, expects the product to be available in early 2010 at US$199.
Via OhGizmo