Here's a good example of how it can really work well: PronunciationBook. The series could not be simpler. It demonstrates the pronunciation of common words, names and brands. It's nothing fancy (and commenters, of course, often beg to differ) but that's why it works, particularly if you're watching it in the Cosmic Panda interface, which makes watching a series seamless and easy.
Cooking for yourself is one of the surest ways to eat well. Bestselling author Mark Bittman teaches James Hamblin the recipe that everyone is Googling.