For my social demography class at UCLA, I have the students visit the IPUMS website to do basic analysis. I have been using SnagIt to prepare screen-capture videos demonstrating various capabilities at the site. This one introduces recoding variables. You will probably want to watch it full frame in order to make out the text. I intended this for students enrolled in my class, but hope it is useful for anyone who stumbles across it.
[youtube http://www.youtube.com/watch?v=U9uk-8W1Ky0&w=560&h=315]