in my experienceAnyway, this site is hosted at Pair.com, who have been a great host for the 2+ years I have been here, and one of the great things I can do is run my own CGI's and other apps on the host (assuming I don't do bad things like gobble up ton's of processing cycles). One of the things I do is run my email thru SpamAssasin (which can be a processor gobbler) when I connect with my mail client (ie, Apple's Mail.app client).
In Mail.app I have spam filtering turned on, and I have a static "rule" set up that catches spam as well. In spite of this triple filtering, about 20 messages a day, that I consider spam, are getting thru, and almost all of them are for drugs (ie, drugs that either stiffen certain things or make other stuff less aware of it's surroundings).
I think one of the things I don't like about the spam I get is how insulting it can be.