Data Replication as an Enterprise SOA Antipattern

this is an useful resource to consider when you deisgn your Architecture and start to play too much with data....
http://msdn.microsoft.com/en-us/library/bb245678.aspx

Commerce Server Architectures use often the data Replication pattern as a Master - Master (http://msdn.microsoft.com/en-us/library/ms978735.aspx) approach when integrated with non Microsoft Environments (SAP, SAGE, etc)