Pulled this off of the Configuration Manager Team Blog at Microsoft…

…[Windows 7 SP1 and/or Windows Server 2008 R2 SP1] it is NOT certified and therefore NOT SUPPORTED for Configuration Manager 2007 SP2 R2 or R3 yet by the Product Group. If you already use it in production , don’t expect Premier Support to help you .

Certification and support statements will take official 90 days after Release To Web ! “

http://scug.be/blogs/sccm/archive/2011/02/19/configmgr-2007-windows-7-and-windows-2008-r2-service-pack-1-sp1-supportability.aspx

 

So just like all other service packs and new releases, it takes time for Microsoft to certify products against the release. Do the smart thing and only roll this out in a lab environment until it’s ready for production!  From what I’ve been hearing, we shouldn’t expect any surprises from Windows 7 SP1; I haven’t heard anything about 2008 SP1 yet, stay tuned! (currently downloading both).