Die spammers, die!

The arms race has officially begun. Based on the activity in my inbox, spammers have changed tactics in response to tools like spamassassin. Where I was once getting 1 or 2 spams a week slipping through spamassassin's radar, I'm now getting 10-15 a day that are passing muster (about 30-50 still get caught everyday). It looks like it's time to upgrade spamassassin, but I get the feeling this is the very beginning of spammers attempting to game the system.