Wireless keyboard crypto cracked
Be aware that if you use Logitech or Microsoft wireless keyboards that rely on 27 MHz technology (non-bluetooth) you may be open to someone listening in on every keystroke you make.
This is due to weak encryption. I have a hard time understanding why people think they can get away with shoddy security implementations.
This article and white paper give you more geek-speak about the underlying details. They specifically mention the Microsoft Wireless Optical Desktop 1000 and 2000 keyboards as being cracked.