I think it's a good omen that both this site and Drupal 4.7 (the software this site runs on) were officially launched yesterday, which was a coincidence. You should check out the Drupal videocasts (which would be described more aptly as screencasts) for a look not only at Drupal's new features, but also for an idea of how this emerging technology can actually be used for practical purposes. Lullabot's Jeff Robbins demonstrates the software's new features in a way that I think is much more digestible than reading a long changelog post.
Continuing on the subject of practical applications...
Our friend Patrick Fitzgerald has already been dabbling in screencasts. I recommend checking out "You're killing me here!" first. It presents a usability critique about Blogger that I don't think would be possible just by writing a blog post.
Finally, ListenShare is a local company that creates podcasts for businesses. It includes Atlantic Station among its clients. I met its founder James Harris at last month's Atlanta Media Bloggers meet-up and can attest that he's a sharp guy and that you should keep an eye on what his company comes up with in the next couple of years.