There are hundreds of typography-related videos on YouTube and elsewhere. Here are three that I really like:
This video about Typography from the Vancouver Film School is a nice explanation of the mechanics of typography in a brief under-two-minute format.
The Typolution video features an amazing use of typefaces as graphics.
ABC is in Spanish, but its still largely understandable for English speakers, and very clever. It animates the Bauer Bodoni typeface to make the alphabet memorable.