I used the simple thumbs up button inside Visual Studio 2010 the other day to send a comment to the authors of Pex, a white box testing framework from Microsoft Research.
Pex and Moles often go together in a test project. Moles can be used to mock any .Net method; a feat that few mocking frameworks can do. Most are limited to virtual methods and interfaces.
Pex is an abbreviation of "Program Explorer"; that was pretty clear. In my comment, I asked them why they used the name "Moles".
Peli de Halleux replied and said "Moles just stands for the little animal that shows up in your garden (coming from nowhere). Is it not an acronym.
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Ha! Sometimes a name is just a name. Its very interesting too. I'm having a blast learning more about it.