I was reading the release notes and was unable to tell if you had to run another AD prep to install Sp1 for Exch 2K7? Anyone know for sure?

Check out this reference: http://technet.microsoft.com/en-us/library/bb629489.aspx It says: If you have not yet prepared the schema for Exchange2007SP1, the account you use to upgrade the server must be a member of the Schema Admins group and the Enterprise Admins group. Note: You must prepare the schema in the same domain and ActiveDirectorysite as the schema master. If the first server that you upgrade is not in the same domain and ActiveDirectorysite as the schema master, or if you want to prepare the schema separately from upgrading the first server, you must run Setup /PrepareSchema from a Command Prompt window on a computer that is in the same domain and ActiveDirectorysite as the schema master.