We came across the excellent Math Encounters Blog through their post Dimensional Analysis and Olympic Rowing, a response to the New Scientist article by Plus author, John Barrow.

Math Encounters is about those problems we might encounter any day where a little bit of maths can really help. Posts cover the maths of carpentry, drinking, management and much more. The maths can be quite surprising and is always clearly explained. And unlike many other popular science and mathematics blogs, it definitely doesn't shy away from the interesting details!