Michael Specter quotes Matt Sergeant extensively in "Damn Spam" for The New Yorker (August 6, 2007).
After the first page of the, which mostly discusses how Richard Stallman supports the freedom to spam, I figured the article would be crap because Matt Sergeant hadn't shown up yet. He does show on page two (which is page 37 in the magazine), and ends up on half the pages. Poor Paul Graham barely gets a mention for filtering, which is slightly less than Bill Gates who said in 2004 "Two years from now, spam will be solved".
Matt seemed the only quoted person to have any perspective: it's only going to get worse, and "[e]ach time we think we have them, they respond with something new." Too bad he couldn't say "Perl" every other word :)
