In a paper titled "A Practical Message Falsification Attack on WPA" researchers in Japan describe how to perform the Beck-Tews style attack against any WPA-TKIP implementation, in under a minute. The paper and upcoming presentation have already been covered in the mainstream media. Thanks to all who wrote in.

If your hardware supports it, time to consider moving to WPA with AES or WPA2.

Cheers,
Adrien de Beaupré
Intru-shun.ca Inc.