Important List of Tables Participating in Repli

--Transactional Replication:
 --Publishing Database:
 select * from syspublications select * from sysarticles select * from syssubscriptions
 --Distribution Database:
 select * from MSRepl_Transactions select * from MSRepl_Commands select * from MSRepl_Errors

--Merge Replication:
MSmerge_contents
MSmerge_tombstone
MSmerge_genhistory