I've left my undecorated mailto: URLs on my site for the last few months to act as spam bait.
It worked, I'm up to about 80 or so spam emails a day.
I finished the spam tracking work on the commonworkspace server today, and have added some entries to the tracking database in the course of testing CRX.
I'll be displaying this data soon on the commonworkspace server (www.commonworkspace.com).
Everything is working, I'm waiting for some art work, and we'll be ready to roll!