Question: I download lots of lectures from iTunes U. The problem is, they usually come with video and there is no audio-only version for many.

How can I, using any software available for Snow Leopard, free or paid, extract the audio from a series of video files and end up with a series of audio files?

Any ideas?

Answer: 
Please try it with [VLC](http://www.videolan.org/), see [Extract Audio](http://wiki.videolan.org/Extract_audio) in the Videolan wiki.
I use AudioHijack Pro it costs money though. I can rip audio from DVDs and Internet streams.