See http://blogs.technet.com/windowsserver/archive/2008/02/04/windows-server-2008-rtm.aspx

 

Now the OpsMgr 2007 support for Server 2008 clock starts ticking. Support requirements will typically be published within 90 days of RTM. At the moment Operations Manager 2007 Service Pack 1 will be a requirement for support of Windows Server 2008.

If any requirements post Opsmgr07 SP1 (now very close to RTM itself) arise for Windows Server 2008 I'll post them here.