Report Builder 2.0 RC1 is now available on Microsoft Download Center.  Use this link for download.  RC1 delivers improvements in the following areas compared to RC0:

• 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.
  

Please direct your feedback to the main Reporting Services MSDN forum, or to http://connect.microsoft.com/.

Thanks,
Robert