Were there any major or really cool features added to SQL Server Service Broker in 2008?
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                A: 
                
                
              
            Conversation priorities
Conversation priorities are a set of user-defined rules, each of which specifies a priority level and the criteria for determining which Service Broker conversations to assign the priority level. Normally priority levels determine the order on which messages are sent or received.
Have a look at the following reference article:
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                   2008-09-18 23:29:07