I've seen flexible rubber USB keyboards before, but this is a true novelty:
Based on a British technology called ElekTex fabric, finally we have the rollable keyboard, made of electroconductive cloth. It's wireless, it has drivers for Windows Mobile 2003 and Windows Mobile 5 (PocketPC and Smartphone), and at just £68.95 it seems reasonable priced for a bluetooth gadget.
The catch? You can pre-order it, but it will not ship for at least another 4 weeks.