[agj]

I've noticed this trend directly. Our incoming non-spam rate has stayed steady at an avg of about 10 msgs/min in the least few years, but our overall average rate has dropped from 250 msgs/min to about 60 msgs/min.

Another trend that I've noticed recently, and what seems is an example of a targeted attack, is an increase in brute force attacks on user accounts. This is likely anecdotal though, if something works once for spammers, they are pretty relentless at trying to attack it again.

I do find it interesting to watch these trends shift, and to have to respond to new methods. It's a great, big, penis-enlargement-pill-fueled, game of cat and mouse to me.