Users of the Microsoft Optical Desktop 1000 and 2000 wireless keyboards should consider replacing them as it has now become a practical possibility to sniff out their keystrokes. Dreamlab have published the required software and instructions for building the sniffing device based on the Texas Instruments TRF7900A 27 Mhz receiver.
Currently only Microsoft's wireless keyboards transmitting on the 27 Mhz band are vulnerable; Bluetooth keyboards are not at risk.
The vulnerabilities in Microsoft keyoboards have been known about since December 2007 but as yet there are no indications that Microsoft has taken steps to mitigate the them.
If you want to use a wireless keyboard the answer, for now at least is to use a Bluetooth device otherwise use a wired keyboard.
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