I read about Project HoneyPot on Slashdot recently, and signed up to help out the cause. I put pots on two of my domains and also donated two MX entries. So the spambots can find them, links to the pots are here and here.
Although I have managed to eliminate virtually all spam from my own email, other accounts that are hosted on my servers are not so lucky, so any progress in the fight against spam is a good thing.
I would encourage anyone with their own domain to create pots and MX records to help out.