The Mathematical Association of America (MAA) has done an excellent service by placing this collection of podcasts online. This diverse set of podcasts consists of talks and presentations given at MAA-sponsored events, and visitors are welcome to use them in the classroom or for their own personal edification. The podcasts here extend back to the spring of 2007, and the presentations include "Why Do Golf Balls Have Dimples?" and "The Joy of Solving Equations". The speakers include experts from Brandeis University, the University of Montreal, and Macalester College. It's also worth noting that for many of the lectures, an accompanying article is available for consultation.