Is everyone's switch in the right position?
Code:
sudo cat /var/log/messages | grep switch
Also, have you installed backports? There is evidently an improved driver in there.
Code:
sudo apt-get install linux-backports-modules-hardy-generic
You might also note that Network Manager will not activate your wireless as long as there is a working connection through ethernet. So, please detach the wire before you continue your efforts to connect wirelessly.

I fear some on this forum blame a Network Manager issue on the driver, install a different driver, find that it still doesn't work, try ndiswrapper, find that it still doesn't work, and give up. I think, in many cases, it's a problem other than the driver.