I had just posted the SimonG post and then in the comments on his thread, I saw reference to this page at candygenius.
They seem to indicate that most all (95%) of comment spam comes from a single proxy, and they show a way to block it (using .htaccess taking advantage of Apache's mod_rewrite I believe). Additionally they mention a few plugins for various blog types (which it notes don't resolve the bandwidth issues the way the .htaccess version does).
**Note that as this gets around, it won't work due to spammers changing to other methods/proxies. After reading around a bit more, it looks as if it is already changing.
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