REPADMIN /ADD I've shown you the beauty of REPADMIN /REPLSUM * /BYSRC /BYDEST /SORT:ERROR to easily find out the largest replication deltas in your forest. Lets take a look at a couple of other things you can do with repadmin, that I use quite a bit.
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Read the complete post at http://blogs.technet.com/brad_rutkowski/archive/2007/04/20/sync-a-partition-from-one-dc-to-another-dc-when-they-don-t-have-a-direct-replication-link-and-other-repadmin-fun.aspx