There has been some talk in the last while about Project Honeypot. Their aim is to provide addresses on websites for email harvesters to get in order to catch them. The addresses that get served up are unique for each visitor, so should one of them receive spam they will know which IP is to blame for the harvesting.
Some articles mentioning them are on tech:knowledge and on Security Focus, read those for a much better overview of what is going on, also check out their FAQ.
I signed up, so should you.
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