I want to point out an excellent resource for an administrator out there who is responsible for Active Directory replication in their environment. The resource is a comprehensive and detailed article solely on using Repadmin.exe. The article goes over what Repadmin.exe can do, adds explanations for the options in the help file, and gives usage scenarios. Some of the information is similar to blog posts I did a year or two ago(here , here and here), but this is one stop shopping and covers all the bases.
This is “must know” stuff for a person who must support or administer Active Directory.
Here’s the link:
Monitoring and Troubleshooting Active Directory Replication Using Repadmin