Gah, I brought my handy dandy CentOS notebook to work today and it fell apart. Hrm. I tried to get it onto the wifi network here and it just could not DHCP an address! Grr! It connected with the AP just fine -- using WEP64 -- and then when I tried to get an address via DHCP, nothing. Just timed out. Sigh. Update: I got it working at home. It looks like having wifi0 in the Device tab of Network Configuration was the problem. Once I removed wifi0 from there, DHCP started working again.