You just can't keep a good super-villain down. Dr. Horrible's Sing-Along Blog, the Internet musical from Buffy the Vampire Slayer mastermind Joss Whedon, was yanked from DrHorrible.com less than a week after it became available. The goal was to allow hardcore fans a chance to see it for free, then hope they'd either buy it on iTunes or wait for the eventual DVD. Shelling out cash to see Neil Patrick Harris (How I Met Your Mother) and Nathan Fillion (Firefly) sing catchy ditties won't be necessary just yet, as Dr. Horrible has now reappeared on Hulu and MySpace, with plans to bring it to Yahoo!, AOL and other websites. If you missed it the first time, now is your chance to witness the online sensation free of charge.