Fed's crack WEP in about 3 minutes

At a recent ISSA (Information Systems Security Association) meeting in Los Angeles, a team of FBI agents demonstrated current WEP-cracking techniques and broke a 128 bit WEP key in about three minutes. Special Agent Geoff Bickers ran the Powerpoint presentation and explained the attack, while the other agents (who did not want to be named or photographed) did the dirty work of sniffing wireless traffic and breaking the WEP keys.

...

Before we get into the steps that the FBI used to break WEP, it should be noted there are numerous ways of hacking into a wireless network. The FBI team used publicly available tools and emphasized that they are demonstrating an attack that many other people are capable of performing.

An interesting read. The end of the article has some good countermeasures you can take if you're running a WLAN.

Since I live out in the country. I've just been using my WLAN unsecured completely. But if you're in the city, I'd suggest going and checking out that article.