Report Builder 2.0 makes it easy for business users to browse for and use centrally-defined and managed data sources. It does this by supporting direct connection to a report server as part of the design experience. It also maintains a list of recently-used data sources that show up at the top of the list each time the user needs to create a new connection in their report. One problem, though, is how to help RB 2.0 users find published shared data sources in the first place.
Read more here:
http://blogs.msdn.com/bobmeyers/archive/2009/03/27/help-rb-2-0-users-find-and-use-shared-data-sources.aspx