Find in Solution Explorer extension by Sam Harwell lets you quickly locate the open document in Solution Explorer. It adds the Find In Solution Explorer tab context menu command that selects the current document in Solution Explorer:

Find In Solution Explorer tab context menu command in Visual Studio 2010

This functionality is a part of several commercial add-ins like ReSharper (ReSharper | Tools | Locate in Solution Explorer menu command) and Tabs Studio (Sync document with Solution Explorer tab context menu command), but Find in Solution Explorer is free and provides exactly what is needed – no more and no less.

The Find in Solution Explorer extension support Visual Studio 2010 and Visual Studio 11. The installer can be downloaded from Visual Studio Gallery.