Bought and sold.
Judging by some of the recent articles on SpamHuntress (another site dedicated to analysis and eradication of spam, including trackback spam), there are indeed lists of vulnerable weblogs floating around the Internet—just like the lists of live addresses that email spammers buy and sell. Update: More SpamHuntress links, including her catalog of TB spam solutions and the new Spamhuntress Wiki, which includes some very interesting spammer profiles.
