Have you seen Weird Al's music video for his song "White & Nerdy"? Man, that's some good stuff. Good enough to pick up, right?
Yup! Step 1 was to grab the video file directly using Video Downloader. I then issued a simple command (step 2):
mplayer -dumpaudio video.flv
The resulting file just needed some metadata applied so it would show up in my music catalog correctly.