Mailinator… ends up getting plenty of its own (averaging over a million emails a day!). This map shows (in semi-realtime) ip addresses that are currently sending the most spam to Mailinator.
Seems rather amusing that the Santa Monica Mountains National Recreational Area are a haven for spammers.
Granted, one comment mentions that “More likely, this is a map of open relays and zombies,” but still… smack in the middle of the Rec. Area?