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[edited by: tedster at 3:26 pm (utc) on Sep 1, 2010]
[edited by: tedster at 9:32 pm (utc) on Sep 16, 2010]
If you're going to be proactive, then you're first going to need an accurate diagnosis - the root cause. Your sales changes may not even reflect a change in the Google SERPs, you know? And since this thread discusses SERP changes, it's hard for anyone to offer you any insights if you only know the sales changes and not the ranking changes.
"... the number of pages that we crawl is roughly proportional to your PageRank"
Am I correct in assuming those of you who have experienced a large traffic drop are all affiliates of larger Brand Name stores?