For the past couple of years I've been giving out my email address as firstname.lastname@example.org... where makesomethingup is replaced with something I make up based on who I'm giving my email address to. For example the email address I give to LJ might be email@example.com. This allows me to identify who is giving out my email address as spam.
Since Saturday, I've received a significant volume of spam to the email addresses I've given to the following organizations: TextbooksRUs.com Ron Paul's Campaign for Liberty (Grrrr!) TitaniumJewelry.com RenovationExperts.com
If you've had contact with any of these organizations, keep an eye for increased volume of drug spam.