I know many of you are wondering where you might find a musical blog starring Neil Patrick Harris as a wannabe evil genius that happens to be directed by Joss Whedon.
Well, here you go. Never say I didn't give you nothing.
Also, keeping with the theme, this looks like great fun.
Edited to add: Dr. Horrible's Sing-a-Long Blog is only going to be up online for free until the 20th (that's tomorrow, friends and neighbors). After that it'll be available for download/purchase. Here's the info.