Well, it looks like AutoMapper has a bug in its AfterMap and BeforeMap methods. Specifically, if you try to use a loop in order to populate the destination object with values derived from the source object, the Map methods themselves are invoked multiple times. Not cool when dealing with EF4. I now have several copies of the same Platforms in my test db. Yay four extra XBox 360, PS3, and PC entities!
As always, a link to SO: http://stackoverflow.com/questions/6460177/extra-iterations-in-a-foreach-in-an-automapper-map/6473451#6473451
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