We published a new KB article last week that describes an update rollup package that enables Microsoft System Center Configuration Manager 2007 Service Pack 1 (SP1) to support clients that are running Windows Server 2008 R2 or Windows 7:
KB974236 - Update rollup for System Center Configuration Manager 2007 SP1 to add support for Windows Server 2008 R2 and Windows 7 clients
J.C. Hornbeck | Manageability Knowledge Engineer