Matt Heusser, definitely a guy who is worth following if you're interested in software testing, has posted the answer in his recent blog. I'll post it in a separate answer below.
Incidentally, on twitter, Matt is @mheusser; his blog, "Testing at the Edge of Chaos" is at: http://blogs.stpcollaborative.com/matt/ I like following Matt because he's passionate about what he does, he clearly enjoys the back-and-forth of discussing software testing, he's insightful, and he's sincerely interested in (a) both learning himself, and (b) helping others learn.
