Hello Tobias (and others),
I've got board and decided to check up on this probject. I was looking at the feature request page on the sourceforge project and decided to whip this out as I have just done a similar upgrade on my own web site and have seen enourmous speed increase from the site.
I wouldn't recommend using it if the site is heavily loaded (imagine 50+ gzips running on your websever) but if it is only a single machine and only the admin is accessing this, it should be fine.
It would be nice to know how much gzip increases the load on a heavily loaded server, but I have no such server.
cioa, Jeremy