Ok so not everything for SQL Server 2008 is available yet, Report Builder is going to have a lag, you can find RC 1 here. This should work with RTM SQL 2008. Here are some of the changes from the last RC;

  • Easy to use wizards for creating table, matrix and chart data regions.
  • Support for directly opening and editing reports stored on the report server.
  • Support for using server resources such as shared data sources.
  • A query designer for Microsoft SQL Server data sources.
  • Enhancements to the Report Builder 2.0 ribbon.