I have no experience in using GZIP compression. But I know someone who does. I suggest that you take a look at the template for domBulletin, one of the OpenNTF.org projects. I know that it has some GZIP features, and I do believe that the code is open for you to do some reverse engineering. This discussion template is highly recommended, by the way. It has some great technology, is admin-friendly and it even looks good.
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This was first published in April 2004