You are probably familiar with the Pending Changes window if you've been using Visual Studio with Team Foundation (View -> Other Windows -> Pending Changes).  Have you ever wanted to have the Pending Changes window show only the pending changes for files in the currently open solution and not all of the other changes in your workspace?

There's button, called "Filter by solution," that does exactly that.  It's located between the Refresh button and the Workspace selector.

The button acts like a toggle.  When it's in the "active" state, the Pending Changes window restricts the list of pending changes to those involved in the currently open solution.  If you don't have a solution open, the button is disabled.