If you are a Joss Whedon, Neil Patrick Harris, Nathan Fillion, or Felicia Day fan, and haven't yet seen "Dr. Horrible's Sing-Along Blog", you are missing out! Even if you're not (yet) a fan, check out the awesomeness of this three act online musical in all its comedic goodness (and evilness). Hulu has it on their free streaming again (reportedly for the next four months). We will be buying the DVD when it becomes available. Go! Watch! Enjoy! I myself will have it playing in the background so I can listen to the awesomeness of the songs until I can sing along. If streaming doesn't go so well for you, it is available on iTunes as well.
Here be preview: