It works fine right out of the box.if you are using BT3 its named as rt73 and in BT4 as rt73usb.there are numerous threads citing how to use this card & Linksys is owned by cisco and its one of its venture,so nothing wrong with that.attach this dongle after properly booting BT and then use the commands you have learned so far to make it work.if still no help then give the output of
iwconfig
ifconfig -a



