Dr. Horrible

[lordofswank]

If you are a Joss Whedon fan, or perhaps a Buffy Fan, Firefly, Angel or you think you will be a fan of the upcoming Dollhouse show then I recommend you take a looksee at Dr. Horrible. You can download it from iTunes, and I am sure it is elsewhere.
Especially do this if you are a fan of the Buffy Musical.