While attending a Linux Expo in London, I came across a company named centrify which create integration tools to allow Linux users to be integrated with Microsoft Active Directory. I have used any of these products, so I’m not sure how effective they are. However this is an imporant find which will ease the management of Linux servers.
Most business systems will have Active directory delployed in some form within the infrastructure. Therefore this is a could find to help minimise system managment costs
http://www.centrify.com/directcontrol/overview.asp