From http://www.printdreams.co.uk/printbrush.php:


World's smallest printer device...!!
The PrintBrush will be by far the smallest printer device in the world that can print full size formats (A4 or letter size)
In many ways it will be even better than stationary printers or other so called "mobile" printers.
For example, it will be possible to print directly in notebooks or other media that would never fit into a conventional printer device.
It will also be completely silent allowing you to print during ongoing meetings, etc.
On top of all that, no wires, no cables, no mess!!