As a related sub-question - are there any CF unit test frameworks that support or make it easier to use mocks/stubs?

The 2 that I spotted in a quick google that look the most promising are MXUnit and CFUnit. Are there others, and which one(s) have the widest adoption and active development? Enough questions crammed into one?

Basically I want to make a good choice.

*edit* Note that at the time of writing the question originally, MXUnit was the go-to and TestBox wouldn't be on github for a few years yet. See comments on the accepted answer.