Yesterday I had some discussion with a colleage about the growing amount of spam thats sneaks through my SpamAssassin filter. He gave me some good advise to install Rules du Jour. This is a bash script that basicly downloads and installs new versions of rulesets for SpamAssassin as the authors release new versions. Information about the rulessets which can be used is found at SARE (SpamAssassin Rules Emporium).
So I installed and configured it right away and now one day has past the result looks very promising. This is definitly a must have enhancement to the standard rulessets of SpamAssassin.