MOM Management Pack for DFS Replication
If you're using the DFS Replication feature of Windows 2003 R2 then you will want to check out the newly released MOM MP for DFSR.
http://www.microsoft.com/downloads/details.aspx?FamilyId=651E7C4A-484B-4AA2-9FBF-F3538075B9E8&displaylang=en
NB: this is not a replacement for the FRS MP (based on Ultrasound) which you should use to monitor sysvol replication - the two components are totally separate features.
