we have a shiny new CTP build of SQL Server 2005 available for download. And yes - it has Report Builder in it.
Should be available to betaplace users and MSDN subscribers (not checked yet and time for home - but should be there!) - so nip over there now and start downloading....
I have checked for availability of the Express versions (which do not include Report Builder):
- SQL Server 2005 Express Edition http://www.microsoft.com/downloads/details.aspx?FamilyId=08215D3F-9A1D-483F-8E21-A2EE19936899&displaylang=en
- Express Manager http://www.microsoft.com/downloads/details.aspx?FamilyId=67079BB3-4FD4-4638-B923-A13741179B98&displaylang=en