This video will walk you through the process of setting up a wireless network on the pandaboard running on ubuntu server 12.04. It should work for ubuntu 11.0 also.
useful links:
http://www.omappedia.com/wiki/PandaBo...
http://ubuntuforums.org/showthread.ph...
http://adventuresinsilicon.blogspot.c...
http://superuser.com/questions/42460/...