You can get it here http://moq.me/ (I love the domain name).
There’s a fascinating back and forth between Ayende and Daniel (kzu) where they discuss different ways to use mock frameworks. Ayende (who developed Rhino Mocks) is more in favor of interaction testing than Daniel who is a state/classic TDDer.
Recently I’ve been trying to separate my tests into unit tests, interaction tests and integration tests. For interaction testing I’ve been using Typemock Isolator, which allows me to break a few runes in order to exercise some hard to test code. Moq is looking very interesting as a mock framework to use with my traditional unit tests.