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MadeWillis - 2:03 pm on Jul 8, 2008 (gmt 0)
Do you think that CTR in the organic space has any affect on placement? If so, wouldn't changing your description tag, in a way, change your rankings? It may not be a big factor any more, but I have to think the CTR is in some way used in the algo.
Personally, I don't think that making any changes to your meta descriptions will change your rankings on Google. It may increase click throughs in the SERPs though, if Google decides to show them.