#9: Starry Night: 3D Background with the Parallax Effect
Using three layers of alpha transparent PNG files, we can can create a pseudo 3-dimensional looking background for a web page. This screencast covers how to do that from start to finish. Since Internet Explorer 6 and under do not support alpha transparency in PNG's, this screencast also covers how to create a warning message that will display only in those browsers.
Links from video: