For many lifelong learners, The Teaching Company is a blessing. Since 1990, the company has recorded university courses taught by leading professors and made them available to consumers. The courses, which tend to be bread-and-butter in a good way, range in price depending on the media format you choose. If you buy courses on sale (they always run sales), and if you buy the cheaper MP3 versions (as opposed to the more expensive DVDs and audio CDs), you can get a lot of value for your money. For example, 24 excellent lectures on Ancient Greece will run you $34.95, which is not too shabby.
Now how does all of this tie into what we do here at Open Culture? Here's how: The Teaching Company has posted a free 45-minute lecture on Martin Luther King, "Stride Toward Freedom," which is part of a larger course called "Freedom: Philosophy of Liberation." You can access the lecture in different audio formats here, and you'll get a sense of what The Teaching Company is all about.
Caveat: The free offering was supposed to have expired on February 28. So it may go away soon.