Degree of Freedom will be on hiatus until January. In the meantime, here are links to some other sources of mathematical interest / entertainment / bewilderment:
Timothy Gowers’s Mathematical Discussions page: informal introductions to and motivations of some key ideas in pure mathematics, from one of the handful of really eminent mathematicians who is also a good communicator.
Terry Tao’s blog: another very good mathematician with a gift for explanations. The blog posts tend to be fairly high-level stuff, but the section on careers advice and the list of selected articles (in the sidebar; scroll down quite a long way to find it) are both generally accessible.
The opinions of the somewhat eccentric but usually thought-provoking Doron Zeilberger, the scourge of the mathematically infinite.