Visual Studio expands the concept of a Solution Folder. From MSDN help:
If you are working with a solution that contains numerous projects, you can use Solution Folders to organize related projects into groups and then perform actions on those groups of projects. To organize and work with a solution, you can:
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Create Solution Folders and move or add projects to them. Solution Folders can be nested to create greater organizational structure.
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Add, delete, or rename Solution Folders at any time, if the organizational requirements of the solution change.
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Unload all projects in a Solution Folder to make them temporarily unavailable for building.
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Collapse or hide entire Solution Folders so that you can work more easily in Solution Explorer. Hidden projects are built when you build the solution.
To work with a group of projects in a Solution Folder as you develop your application, you can:
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Apply the same policy to all the projects by setting the Policy File property for the Solution Folder.
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Build or rebuild all the projects. The projects are built in the order specified by the project dependencies.
Just right-click on your solution node, and choose 'Add>>Solution Folder' to use this. I believe this can definetely be a handy feature for the larger projects out there which use Visual Studio.