Videocasts from economists? Yes.
Brad DeLong muses over his morning coffee at Google Video.
James Reese expands the successful Radio Economics concept into the world of moving pictures at Video Economics. You can subscribe to Video Economics by entering this address into iTunes or other video podcast software. (http://www.acidplanet.com/podcasts/rss.asp?id=137)
They take different appraoches to the medium. DeLong does the talking head routine. Reese's site is, at least for the first episode, a slide show with audio. For a lot of things, the latter would be better. Both sites are worth your time to check out.
The Mises institute also has a bunch of video podcasts available through the iTunes music store or from their website. Of particular note is a lecture entitled "Rothbard's Left and Right 40 years Later."
Isaac
Re: "For a lot of things, the [a slide show with audio] would be better." I agree...