I've got an Atheros card in my server, which is currently running Breezy.
I don't use WEP; my neighbours aren't wireless ;-)
To get going, and at least prove the functionality of the system, you could try turning off security on the router (you can always use MAC filtering if it's a concern; this is what I do) and then you can at least read resources on the internet about how to set up the WEP/WPA/WTF security.