Sometime in the last few days the Source Control Explorer in VS 2005 stopped responding. I would click on in under the expanded TFS Project and nothing. After some research I found that it may either be related to the computer browser service or to a corrupted VS 2005 user settings file.
It turned out to be the later. A post from Shannon Braun pointed me in the right direction. So after using the command line option to reset VS 2005:
"%programfiles%\Microsoft Visual Studio 8\Common7\IDE\devenv.exe" /resetuserdata
I was able to reset my environment and correct the problem. Only problem is I have no idea how many "tweaks" I've made along that way that I will have lost!