Watch ‘Dr. Horrible’s Sing-Along Blog’ free, for a short time

If you haven’t seen the new three-act Internet series Dr. Horrible’s Sing-Along Blog from Buffy the Vampire Slayer and Firefly creator Joss Whedon, you’ll want to check it out tonight before it vanishes forever. Psych! It’s just moving to download for a small fee. You can get it for $3.99 from iTunes.

Dr. Horrible is far from horrible, and it stars Neil Patrick Harris (Doogie Howser, M.D., How I Met Your Mother, Starship Troopers), Nathan Fillion (Firefly, Serenity) and Felicia Day (Buffy, The Guild).