Dr. Horrible's Sing-Along Blog

I know there's an "internet sensation" every ten seconds, but you really, really, really have to watch Act 1 of Dr. Horrible's Sing-Along Blog, a singing, acting, evil Doogie Houser bwah-ha-ha-ing bit of genius.

Conceived by Buffy the Vampire Slayer creator Joss Whedon, Dr. Horrible's Sing-Along Blog, a three-part musical miniseries, has become an online sensation since Part 1's release Tuesday. The traffic quickly crashed the server for free-view website drhorrible.com, and iTunes' downloadable version instantly became, at $1.99, the No. 1 video.

The musical stars How I Met Your Mother actor Neil Patrick Harris as tongue-tied super-villain Horrible, who hopes his freeze-ray gun will gain him standing with the Evil League of Evil and win him the girl of his dreams. Nathan Fillion (Desperate Housewives) co-stars as self-absorbed hero Captain Hammer. Felicia Day's Laundromat girl captures both their hearts.

Act 2 comes out later today and the series concludes (for now) with Act 3 on Saturday. After that, you'll have to pay to get it from iTunes. Created for a cost in the "low six figures", the series is expected to make a fortune on paid downloads.