It is possible to hook up a DLink DIR655 Access Point to your Windows domain using Windows 2008 Network Policy Server. Actually, this should work for any access point with WPA Enterprise and Radius support. This allows wireless devices supporting WPA Enterprise authentication to log on to your wireless network using their domain credentials. This on its turn gives you the ease of only maintaining your users in one central location: Active Directory. It also prevents having only one shared key that everybody uses and you can not change easily without everybody having to adjust their configuration, like with WPA PSK and WPA PSK2. So its far more secure.
Follow these steps to set this up: