Star Wars Detours is a new Cartoon Network series from Seth Green and Matthew Senreich. That's Cartoon Network, not Adult Swim though, so the jokes are aimed at a younger audience than on their other show, Robot Chicken.
(Lord of the Rings)
On a live episode of This American Life, Joss Whedon played the piano and sang a song from Commentary! The Musical.
(Dr. Horrible's Sing-Along Blog)