OK, I mentioned this before in the Firefly/Serenity thread, but it didn't get any traction there. I'm trying again.
Today the first of three episodes of
Dr. Horrible's Sing-Along Blog hit the web. Stars Nathon Fillion and Neil Patrick Harris as a superhero and villian, respectively. With singing. Very silly so far.
The second part will be Thursday, the third Saturday, and after Sunday you would have to buy them, but they are free streaming until then.
Sure, it doesn't have the character depth of Firefly or Buffy, but for three 15 minute episodes, it should at least be good fun. And something to tide us over until Dollhouse hits the air.