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incidentally... my SERPs position has plummeted for a few phrases that are related to the rich-snippets, and i'm half-convinced that its because they contain hidden text (which is fairly normal for rich snippets). has anyone else seen the same?
obviously google must be doing this to bazillions of other sites too
I met a webmaster recently who runs sites that effectively 'scrape' to provide a service. He said he loves microformats as it makes it so much less time-consuming to code the scrape elements of his system. He likened it to XML in it's standardisation.
they contain hidden text (which is fairly normal for rich snippets)
More is better, except for hidden text. In general, the more content you mark up, the better. However, as a general rule, you should mark up only the content that is visible to people who visit the web page and not content in hidden div's or other hidden page elements.