I think most of its publicity came from its being on CNN, though I can't find the video. However, I was able to find a transcript. The hosts were discussing how easy it is to produce an Xtra Normal video:
LEVS: Now the next thing I'm showing you is what might become a new phenomenon. There's a program out there called Xtranormal that will allow you to create your own animated video.I had seen "So You Want to go to Law School" before but didn't know it had gone viral. I learned about it when I discovered that my own XtraNormal video (on YouTube) had started picking up thousands of new hits and I began searching for the reason. Apparently my video is piggybacking on "So You Want to go to Law School", being listed as the second video reference for it.
LEVS: By just typing in words, and watch what happens, here's an example of a guy. This guy put one together called "You're sure you want to go to law school?" Take a look.
David discussed his XtraNormal video in two posts on his blog, which does not appear to be a law school scambuster blog:
Congratulations, David, and awesome job with your video!