I've been using WordPress for a little while now, and it ships with Akismet spam blocking plugin. I was a little skeptical after all the issues I had with Movable Type's spam blocking tools, but I'm impressed with Akismet. It's not perfect, but it does a good job. I'm going to wait a couple more weeks before final judgement, but the way things look right now, I'm probably going to be able to safely disable comment moderation.
For those of you not using WordPress, Akismet is particularly nice in that it's a hosted service, which means it learns from everyone and can be used with any blogging system (or anything else that does spam processing). There's libraries and plugins available for a wide variety of platforms, including CF, Java, Ruby, and .NET.
Best of all, it's a free service for personal use. If you're making money with your site, you need to buy a license, but if not, it won't cost you a thing.
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