In response to comments on my post about MTEST that said, "People should use open source tools instead," I can only reply, "If some people can't afford cheap, what makes you think that everyone can afford free?" I'm a big fan of Python, NumPy, SciPy, matplotlib, and everything else, but they have their costs too --- costs that scientists with deadlines often can't afford to pay. If someone wants to give me a grant to go and measure how productive different kinds of scientists are using different combinations of open and closed source software, you know how to reach me...