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Google is no longer following my robots.txt file. It has indexed hundreds of pages that I have disallowed.
Generally it's best to make any changes when SERPs are stable, never within an update due to panic!
[edited by: tedster at 7:43 pm (utc) on May 13, 2010]
[edited by: londrum at 3:31 pm (utc) on May 21, 2010]
While accurate meta descriptions can improve clickthrough, they won't impact your ranking within search results.
[edited by: tedster at 7:40 pm (utc) on May 22, 2010]