CNET News.com reports on AirMagnet Distributed 4.0, a hardware/software package that can block and disable unauthorized users on WiFi networks. AirMagnet uses remote sensors to analyze wireless traffic and identify unauthorized users. Peace of mind doesn't come cheap, though: the AirMagnet hardware/software package cost US$7,995 in the U.S.

CNET's article includes links to information on several other WiFi network security products.