Has anyone had any experience of the various Bayesian email filters that are around ? I am thinking of implementing one of them on my Linux mail server, helpfully I have 5+ years of spam/non-spam messages to feed it (though I probably need to clean up the data a bit, I think there is still some spam lurking in the non-spam folders).

The filter that I am leaning towards at the moment is this one http://www.lbreyer.com/unix.html , but I haven't tried any of the filters yet.