I came across a site called ShowMeDo a few weeks ago and I have gotten hooked on it. It is a site where people have created short screencasts for different subjects. These videos include subjects such as Python programming, the TurboGears web framework, creating screencasts of your own, and even how to make a perfect cup of coffee. While you are there enter your email in the box on the side to be notified of any new videos that get created. If you are a Ruby programmer make a small video of some of the features of the language that you like and submit it to the site so all can benifit from it.
If you are on a Linux machine you can use pyvnc2swf to create your own videos. Check out this link to Linux.com to get an idea how to do it. If you are on Windows then I would recommend Camstudio2.o. Both of these work very well and are FREE and opensource.