It took a little while, but the CSS-Tricks Video Screencasts are now listed properly in the iTunes podcast directory.
Even cooler, you can just straight up search for "CSS" in the iTunes search area and it comes up as one of the ones right in the Podcasts section. Right next to "Let's Make Love and Listen to Death from Above". Perfect.
Here is the direct link:
CSS-Tricks Screencasts (iTunes Link)