Podmatic: "Create, find & send podcasts" Lots of categories to browse/use, including an Education category containing hundreds of podcasts and other links. "...podcasting has traditionally been restricted to the crafty, tech-savvy and patient. ... many would-be podcasters are confronted with an array of technical hurdles (i.e. recording software, RSS and XML syndication, hosting, etc). ...To expedite podcasting's transition from fad to mainstream, our goal is to drop these barriers of entry for people interested in producing podcasts."
The Learning Pod: "Conversation, chat, discussion and information provided by people in education for people in education together with teachers notes."
Odeo: "Odeo is a creative way to record and share audio—and it's free. ...As a company, we believe strongly in the democratization of media. We think that giving more people powerful tools for the creation and distribution of media will result in more knowledge, ideas, art, truth, and amusement available to all."