> What I can't figure out is this: There are dozens of audio codecs that can 
> take a sound file and make it *at least* 5x smaller with absolutely _NO_ 
> detectable loss of quality at all. (And far smaller still if you're 
> willing to sacrifice a little clarity.) But it seems there are no codecs 
> that can shrink video without a visible loss of quality. (Aside from a few 
> lossless codecs which usually give you about ~20% smaller or so.)

Huh? Even MPEG2 (as used on DVDs) can reduce the raw bitrate from 240 Mbit 
to 10 Mbit (so 24x smaller) with little detectable quality loss.  More 
recent codecs will definitely improve on this, like xVid and h264.

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