I think that it would be great if we could create sub folders under the Reports folder of a SSRS project in BIDS so that if we needed to create folders for our reports on the Report Server we wouldn't have to keep them in separate projects with separate data sources.
I know that we can have multiple projects in a single solution, but this is just a work around. I've got a dozen projects in a single solution in BIDS and when I make changes to reports in different folders that are related but for business reasons are in different folders I have to find them in each project. It would be much simpler and quicker if they were in a single project but in different folders.
This would also allow for BIDS to allow you to link to a report in a sub folder for drill down.