The storage team at Microsoft has just announced their release of the DFS Replication Management Pack for Operations Manager 2007.
Supported operating systems:
Windows Server 2003 R2
Windows Server 2008
Supported monitoring platforms:
System Center Operations Manager 2007 SP1
System Center Operations Manager 2007 R2
More information is available in their blog post at http://blogs.technet.com/filecab/archive/2009/10/19/dfs-replication-management-pack-for-operations-manager-2007-is-available.aspx.