What’s the most pop­u­lar pod­cast in the High­er Edu­ca­tion sec­tion of iTunes? Ahead of all the pod­casts from Prince­ton, and all of those from Yale, and ahead of the Under­stand­ing Com­put­ers course from Har­vard, and even the psy­chol­o­gy course from UC Berke­ley, is an unex­pect­ed pod­cast called Twelve Byzan­tine Rulers: The His­to­ry of the Byzan­tine Empire. The course, which focus­es on the Greek-speak­ing Roman Empire of the Mid­dle Ages, is taught by Lars Brown­worth, who teach­es high school at The Stony Brook School on Long Island, New York. And it gets rave reviews. “I’m dis­ap­point­ed because I don’t think I’ll ever find a pod­cast that I enjoy as much as this one.” “This pod­cast has quick­ly become a hit with me and all of my friends, even those who don’t like his­to­ry so much.” You get the gist.

The suc­cess of this course makes us think that com­pa­nies that sell dig­i­tal lec­tures for a fee might not be long for this world. Take The Teach­ing Com­pa­ny for exam­ple. They’re in the busi­ness of sell­ing pol­ished, lec­ture-based cours­es, which can often be very well done. And, yes, they offer too a course on the Byzan­tine Empire that retails in audio down­load form for $129. So what will the savvy con­sumer do? Down­load Brown­worth’s course for free? Or pay $129? This is not a knock on what The Teach­ing Com­pa­ny is doing. I like their prod­uct and can appre­ci­ate their need to sell prod­ucts to recoup their costs. But you can’t com­pete with free. With so many uni­ver­si­ty cours­es now tap­ing their cours­es and allow­ing peo­ple to down­load them to the ubiq­ui­tous iPod (see our full list of uni­ver­si­ty pod­casts), you have to won­der whether The Teach­ing Com­pa­ny is just anoth­er once viable busi­ness mod­el that is being steadi­ly com­mod­itzed by the Inter­net.