LinuxSecurity has a great little tutorial about how to crack WEP pretty darn quickly to wow your friends and scare the crap out of your coworkers. The tutorial was run on an old laptop running OpenBSD with a PCMCIA 802.11b card. I’ve got similar hardware just kicking around. I might have to have a go at it. The Airtools package (installed by default) covers pretty much everything you need for sniffing out Wi-Fi, logging wireless packets, and breaking yourself some WEP.