I'd posted before about the problem with Google's Blog search and spam blogs.
But it looks like Google are well aware of it, and trying to address the issue, according to Blogger's blog Buzz, e.g. by using the "Flag as Objectionable" info (so do help the process along, if you encounter a spam blog on Blogspot, remember to click that flag in the Blogger navbar). That post makes interesting reading e.g. they explain why they're not using CAPTCHA for posts.
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