You may still be interested to read this blog post from the developers of SSSB which describes how to configure your service broker routes such that the calls to your service are distributed into multiple machines implementing the same service, i.e. create a load balancer so that the workload of importing the files can be distributed over multiple machines:http://blogs.msdn.com/b/sql_service_broker/archive/2008/07/14/using-multiple-routes-in-service-broker.aspx