] So I have a feeling that what we're going to see after
] the widespread implementation will not be a decline in
] comment spam (and, on weblogs which support TrackBack,
] TrackBack spam), but rather a marked increase.

This is a nicely thought out article that follows up on my question posed on the show: ok, this eliminates PageRank advantages, but spammers don't give up -- where do they go next.

Volume. Damn it.

I kind of like the criticism angle, too.