GroupOn, the massive social media site which has sent surprisingly little spam for the past year, is now hitting an email address that was shut down before 2005. GroupOn sent the email through their own IP range; no ESP was involved.
Ning, a social networking service intended primarily for entertainers who want to manage fan networks but now used by political and activist organizations as well, just sent a bulk email to an email address that has never existed. The Ning user that sent the email, and probable source of the spamtrap, is the Patriot Action Network, a prominent Tea Party organization that has appeared in my spamtrap collection a number of times before.
FictionCity.net, a social networking site for artists, is sending bulk email to a personal email address of mine that has been closed for over nine years, via ESP SendGrid. Since this email address has belonged to me since it was created and never existed prior to that, I *know* that I never requested this email or any email from this site. Somebody (probably not FictionCity.net) scraped the web or old Usenet archives to find this email address. FictionCity.net almost certainly purchased a list.