Hi, I have the referenced USB WiFi adapter, manufactured by SparkLAN, recognized by BackTrack 4 as WL-682 802.11g USB Adapter.
I have it connected before I boot Backtrack 4. If I ask for USB devices it telles me the USB adapter is there, but if I ask iwconfig, it doesn't find it.
In Windows the driver installed is a PRISM02.
Any way that BackTrrack recognizes it, install an appropiate driver and I could use it for auditing wireless networks?