I wanted to get mod_gzip working with my Apache installation in OS X and I figured that other people might want an easy, step-by-step guide for the procedure so I threw one together. For presentation's sake, I've written up the procedures in an entry on my blog: Exordium.
It should only take about 10 minutes to get your site running with mod_gzip. Simple enough. I hope that it helps somebody out.
[robg adds: I haven't tested this one.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030711014259649