Some folks have run into a problem using SQL Server 2000 Reporting Services now that Visual Studio 2005 has been released.
Specifically, the Report Designer in RS 2000 doesn't work in Visual Studio 2005.
Luckily, there is a solution: The Visual Studio 2005 license includes a downgrade provision. The details are located here:
The short answer is if you buy a copy of Visual Studio 2005, you can use that license to run the older version. You need to call the Microsoft Supplemental & Replacement Parts Center to get a copy of the Visual Studio .Net 2003 media.
Take care and good luck,