The mapping of interface member [...] is not supported.

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This is good to know, strange solution but it works:

http://social.msdn.microsoft.com/Forums/en-US/linqtosql/thread/bc2fbbce-eb63-4735-9b2d-26b4ab8fe589

I created an Interface that my Linq to SQL classes implement so that I can create a generic function that will work across a few tables.  When I used the double equals (==) instead of the .Equals() in my LINQ query I got the runtime exception:

The mapping of interface member [...] is not supported.

Changing my query up to use the .Equals() it runs beautifully.