radius server implimentation

["ken zo" <kenzo_chin () hotmail com>]

I'm looking into implementing a radius server that will do authentications 
for a Cisco VPN 3000 concentrator. I will also use that to configure all the 
Cisco Aironet 1200 access points to authenticate any wifi users.  If 
possible, I would like to also be able to authenticate the users to a win2k3 
active directory.  NOT sure if this last part is possible.
I'm wondering if any of you have done this and if you could give me some 
guidance.

Thank you.

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