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Google finally has a plan to deal with comment spam! And all the big players are on board. Great. The idea is simple: hyperlinks tagged with rel="nofollow" don't confer any google juice, thus hopefully taking away the reason for the spam in the first place.
I would install this feature here right away except for one thing. We already strip out *all* HTML from anonymous comments. Links are not in any way possible. And we still get comment spam! Still, maybe if everyone does this it will help. Clearly the situation is out of control and it is worth trying something.