So, I will start this out with a disclaimer, I am flat out a fan of Josh Whedon's work. Buffy the Vampire Slayer was an incredibly rich story line with complex plots and actions with consequences that came in later episodes. Firefly was all to short lived and Angel was fun.
My lovely wife came home and said I have to listen to this site she found, Dr. Horrible's Sing-along Blog. It sounded silly so of course, I put it off. I finally pulled up the site... hey, Mutant Enemy Productions, Nathan Fillion, Felicia Day, Patrick Neal Harris, what!
If you haven't heard of it, go listen. It's about 40ish minutes of fun entertainment.