Mark Loveless has discovered a flaw in Windows wireless security. The fix is pretty simple:
Go to “Start,” “Control Panel,” “Network Connections,” and then right click on the entry labeled “wireless network connection” and select “Properties” from the drop down menu. Then click on the “Wireless Networks” tab, and then on the “Advanced” tab at the bottom of that window. A box should pop up that gives you three buttons to choose from: Select the one next to “Access point (infrastructure) networks only.