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The drawback with Akismet is that commercial sites are supposed to pay. If you don't pay or choose the lowest cost option, the Akismet people openly state that your blog's calls on their database will be given a lower priority.
I don't like relying on third-party machines in any case (even though Akismet themselves have a good reputation), so I use both Bad Behavior and Spam Karma. They overlap to an extent, but also handle slightly different things and/or in different ways. SK has the particularly useful feature of closing comments for old threads, which is one of the most effective ways of killing automated spam.
Between these two, I get to keep comments open, unmoderated and rarely see any spam.
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