I mentioned the other day available on iTunes before they pulled them off the site. I've consistently had at least one of four songs from the show stuck in my head the past few days now.
As for why they pulled the videos, it's all part of an effort by Joss Whedon (creator of Buffy and Firefly) to change how TV is distributed. I read an interview with him recently and it reminded me of what I've previously said about how TV is going to be presented.
Anyway, if you liked Dr. Horrible enough the first time you saw it, or if you're dying to know just what the hell I'm talking about, spend the 4 bucks for the "Season Pass" and get all 3 episodes. Think of it as supporting... the future.
Teaser from Dr. Horrible's Sing-Along Blog on Vimeo.
And speaking of the future of media, check out what Stephen King's been working on: