This page offers great information for beginners, including the "7 steps to screencasting" and important tricks. I especially like how the text is arranged to make reading easier.
Another page of this site was bookmarked earlier. This one presents a new look at Bloom's Taxonomy, and presents a series of app evaluations sorted according to level. Screencasting has the potential to fit into a number of categories.
Here's how to use snagit to start the process of making the video livelier to the viewer. This team explains how to add 3D to screencasts too. It's a resource that will not be used for every screencast because it demands time, but could add a nice touch to special topics.
Augmented reality is going to inhabit every screencast in the near future. It's a great way to call attention to small details while presenting a topic.