Just an FYI that I posted a note about a solution to push install failures when your MP is Win2K8 over on our new ConfigurationMgr blog:

http://blogs.technet.com/configurationmgr/archive/2009/01/22/configmgr-2007-client-push-may-fail-when-the-management-point-is-installed-on-windows-server-2008.aspx

Enjoy!

J.C. Hornbeck | Manageability Knowledge Engineer