A co-worker recently asked about Drupal screencasts. The short answer is: there are tons of them out there. I already have almost 2GB of them on my hard drive and it seems like there are more and more being produced every day. I replied with the following (undoubtedly incomplete) list. I can vouch for most of these, but not all:
http://drupal.org/handbook/customization/videocasts
http://learn.awakenedvoice.com/
http://www.drupaldojo.com/ (sometimes screencasts only available as torrents)
http://www.lullabot.com/videocast (their audio podcast is also top-notch)
http://www.seoecom.com/cms-basic
http://www.seoecom.com/cms-advanced
http://www.bryght.com/tags/drupal-5
http://www.theartlab.net/podcast/drupal-school
http://www.youtube.com/results?search_query=drupal&search=Search (perhaps a bit overwhelming)