Comment 10 for bug 89665

the rt73 drivers do not work out of the box for gutsy beta as well, this is a serious issue that ive always had since feisty beta when I first tried out ubuntu, the serialmonkey drivers work only for WEP on the belkin usb dongle:
 Bus 004 Device 003: ID 050d:705a Belkin Components

It seems whoever wrote the driver forgot to put in the correct USB ID's here is the fixed driver
http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Flinville%2Fwireless-dev.git&a=search&h=rt2x00&st=commit&s=rt73