Rifftrax.com is the new business of Mike Nelson, Bill Corbett (Tom Servo), and Kevin Murphy (Crow), where they riff new movies. Just buy and download the mp3, put in your DVD, and follow the instructions to sync them up, and be ready to laugh your ass off.
The Twilight series is top notch, also Transformers, anything M. Night Shaymalan, and especially the really rotten new movies like The Room and Birdemic are totally awesome.
Doesn’t James Lileks contribute on some tracks? I remember reading something on his blog about it some time back.