I get hit by a lot of blog spam - depending on the time of day, up to 3 attempts per second. It's one of the reasons I moved to MT. While I really liked using WordPress, I couldn't ever get the junk filtering the way I wanted it. MT catches about 90% of the spam if not more. I moderate comments, so I'm able to catch that extra 10% when I'm checking my approval queue. Even so, it gets annoying. I'm tired of reading about Viagra. My solution? I wrote a script to go through and pull the IP's of every comment marked as spam. I've noticed only 1 false positive in my entire time running MT, so I'm mostly confident in only pulling abusive users' IP addresses. I populated my bannedip's table with this list. If you're having problems posting comments because your IP is banned and you're a legitimate user, let me know and I'll fix it. If anyone is interested in doing the same for their blog, I can provide the script I used to do this as well as a list of the offending IP address.
Blog spam sucks.
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Interesting, why dont you publish the IP addresses that you know are spammers then people could add them to their own blacklists - I suppose one of the downsides to that is your site may get attacked.
It's too late, but: http://dan.langille.org/2006/05/03/spam-is-very-annoying/
Melkor:
Most of the IP addresses used for spamming are compromised machines. When/if they are fixed, the blacklists will be outdated.
It is much simplier to just use processes that require manual intervention. This blocks the automated scripts so often used in spam scripts.