Use iTunes to find useful podcasts. First you need to click on the iTunes Store. Then you can click on Podcasts (or iTunes U if you are looking for higher ed content). Once you have clicked on Podcasts, you can select Education in the Categories box. This will then show icons of the featured education podcasts, and on the right hand side you can see the top educations podcasts. If you click on the arrow (inside the circle) to the right of Top Podcasts, you will be taken to a screen showing the Top 100 Education Podcasts.

Better yet, click on the Power Search link on the right hand side of the page! (Directions below.)