A colleague of mine had a problem today where she connected to RSWebParts on MOSS 2007 and SharePoint gave her a security exception.
The solution was to make an exception for the RSWebparts assembly in WSS_MinimalTrust.config.
The problem with that approach is that you do know the PublicKeyBlob of the RSWebParts to make the exception.
How you go about finding a the PublicKeyBlob is to open up the assembly in ildasm.
Check the assemblies manfiest, and there will be the PublicKeyBlob in there.

tags: SharePoint, PublicKeyBlob, MOSS, RSWebPart
Cross-posted from tariqayad.com