Bring up a radius server (Microsoft IAS/NPS) and tie that to AD. Then you would just configure 802.1x using PEAP. This will require you to have an ssl certificate on the radius server.
There are a lot of docs out there that will show you how to set everything up. You can also search this forum for some good info.
http://techblog.mirabito.net.au/?p=87
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-Scott
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