From the cold winter of Seattle, i've managed to gather a small bunch of guides that explain the new features and guidelines of service hardening in vista and Server 2008.
Windows Service Hardening:http://blogs.technet.com/askperf/archive/2008/02/03/ws2008-windows-service-hardening.aspx
Services isolation in Session 0 of Windows Vista and Longhorn Server:http://blogs.technet.com/voy/archive/2007/02/23/services-isolation-in-session-0-of-windows-vista-and-longhorn-server.aspx
Least privilege for services:http://blogs.technet.com/voy/archive/2007/03/21/least-privilege-for-services.aspx
Per-service SID:http://blogs.technet.com/voy/archive/2007/03/22/per-service-sid.aspx
Write-restricted token:http://blogs.technet.com/voy/archive/2007/04/01/write-restricted-token.aspx
Network restrictions for service hardening:http://blogs.technet.com/voy/archive/2007/04/02/network-restrictions-for-service-hardening.aspx
Services Hardening in Windows Vista:http://www.microsoft.com/technet/technetmag/issues/2007/01/SecurityWatch
enjoy (although I don't think that is the proper word for service hardening... :-))
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