For the folks looking for an answer:

I had something happen today that normally doesn’t happen.  I loaded a solution, and Visual Studio just closed.  No error message, no dump.  It just stopped.  Gone.  I tried many, many times, and it crashes silently when opening one particular solution.  It works fine on every other solution.  At first, I thought I’d disable my add-ins, so I disabled:

• ReSharper
• Gallio
• TestDriven.Net

I even reinstalled PowerCommands because I found someone who had a problem with that.  Nothing worked.  I finally started thinking about the variables.

The one variable I missed was that this solution had last been worked with before I upgraded to Visual Studio 2008 SP1.

Solution:  I deleted the *.suo and *.cache files next to my solution file.  I reopened the solution, and everything is fine.