I wrote this back in August, but these shortcuts weren't availabe in the July CTP. Now that beta 3 is out, you may want to give them a try.
I've learned two shortcuts recently that I didn't know existed in TFS source control integration in VS. These may or may not work based on the build you are using.
Double clicking the Source Control node in the Team Explorer will bring up the Source Control Explorer window. What I learned recently is that holding the shift key and double clicking Source Control (after selecting only that node) will bring up the Pending Changes window.
The other shortcut is more useful. You may already know that double clicking a file in the checkin window will bring it up in the editor. If you hold the shift key while double clicking a pending edit, it will launch your diff viewer so you can see what's changed. That's kind of handy.