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It's free, its a module for apache that can tell if the browser supports the compression if it does then the pages are compressed on the fly and sent in gz format and the browser takes care of it.
You cant even tell its running xcept if you do a nice netcraft query.
You can specify which type of pages to compress, what file types, etc.
Worth the install, havnt found any problems what so ever and its saving bandwidth. There isnt any additional stress on my server and pages can be served faster because they're compressed.
hah i like this program so much i searched this site for mod_gzip and responded to this article from 2001!