In Jan. we redesigned our entire site, kept the same file names and added new pages. We anticipated being dropped from Google and within 24 hours were gone. Before we ranked in the top five for our keywords. It's now 45 days later and we still MIA for our keywords in google but kept the same ranking in every other search engine. We emailed google and after 3 replies said one of their engineers would look into it. That was a couple weeks ago. To make up for the lost traffic we increased our links on related sites and advertising elsewhere. Sales in Feb. were the highest ever.