Recently released was the teaser trailer for Joss Whedon's new project - "Dr. Horrible's Sing-A-Long Blog" - three 10 minute webisodes to be released in the next few months (July 25th, it appears)
No songs/music shown (except for the cheesy homemade score), but definitely has that kooky, genre-bending humour of Joss Whedon.
It stars Neil Patrick Harris as Dr. Horrible and Nathan Fillion as his heroic nemesis Captain Hammer.
Plot description: "It's the story of a low-rent super-villain, the hero who keeps beating him up, and the cute girl from the laundromat he's too shy to talk to."
I like this teaser, right down to the cheesy music. This will be geekily fun.