Microsoft shipping its 802.11g USB 2.0 adapter: For many machines, this adapter is the best approach, even though its $69 price tag far exceeds similar PC Cards. The USB 2.0 adapter has an external antenna and can be swapped among machines, and for computers without easily accessible innards or occupied slots, it's a simple solution. The 2.0 speed allows full 802.11g performance. The adapter handles WPA and 802.1X authentication.