Dr. Horrible's Sing-Along Blog, acts 1, 2, and 3 are available free until July 20th at midnight EDT, me thinks. They're for sale on iTunes, for those of you who want to shell out the four bucks. NPH, Nathan Fillion, and Felicia Day singing their little hearts out. Good times. Plus, it's always good to support the internet movie format.
Pandora: radio from the Music Genome Project. I love how you plug in a band, and based on the qualities of that band's music, the site pulls music from the database you'll enjoy. Put music theory to work for you! Frickin' genius.