I have a Visual Studio 2008 solution, and I would like to include a real folder in the solution, but not at the project level, instead at the solution level.
You can also add standalone files in a solution folder, and they will be source-controlled. But be wary that VS tends to put these files in the same folder as the solution file - the "Solution Folders" are virtual and don't corresspond to real filesystem folders. To have a real filesystem folders I think you would have to create the structure yourself and then choose "Add Existing Item".