Nanotech hits the gadget market with the Handheld Germ-Eliminating Light from Hammacher Schlemmer. According to them:

This cell phone-sized disinfectant light is the first to use UV-C light and nanotechnology (the science of manipulating matter smaller than 1/10,000 of a millimeter) to eliminate 99.99% of E-Coli, staphylococcus, salmonella, and germs that cause the flu and the common cold.

The light uses the same UV technology found in hospitals to sterilize surgical instruments, allowing you to disinfect workplace keyboards or telephones, as well as items in the home that sustain germ vitality such as toothbrushes and cutting boards.

Without using toxic chemicals, the light disinfects surfaces in 10 seconds as it is held 1/4" to 4" away from the contaminated surface, and the internal timer signals when sterilization is complete, while the automatic shut-off feature ensures safety. Fits easily in a shirt pocket or briefcase for convenient travel.

No word yet on its effectiveness.