I tried my hands at screencasting for the first time a couple of days back and posted my output on YouTube. Check it out, and tell me what you think:
If you are interested in doing your own screencasts, just download and install CamStudio, a free and open source screen recording software. The output that CamStudio gives you is very high quality (i.e. the file size is very big), so I used another product called Handbrake to reduce the audio and video quality a bit. I then uploaded the output I got from Handbrake onto YouTube (you have to sign-up for a free YouTube account first).