How to bookmark a project location in TFS
Team Explorer has a "Favorites" mechanism, however it only functions for Team Explorer nodes (such as Reporting or Documents folders) and not a position in Source Control Explorer.
If you want shortcuts to Visual Studio projects then I'd recommend you download the files in the usual way to your local hard drive and then create shortcuts to the .sln files etc on your desktop or something. Not exactly rocket science but does it get you what you need?