Are you a Firefly/Joss Whedon/Musical Fan?

Today the first act of Dr. Horrible's Sing Along Blog was launched. This is a weird thing, a production by Joss Whedon starring Neil Patrick Harris and Nathan Fillion and ONLY broadcast on the internet. And it's good. Very good. Enjoy this now while it's free because after it's over it'll be up on iTunes and will cost money.