I used Windows Media Encoder to do my screencast this week. I chose to do a step by step tutorial for logging onto the website that accompanies our Spanish textbook. I chose to do this because I plan to post a link for this on my website to show the students how to access the textbook website. I had some trouble when trying to do a screencast with the entire window because I have a widescreen computer monitor and the entire window would not show up on playback. Therefore I decided to just do a selection of the screen, which worked out fine.
Check it out, I think this will be very useful for my students.