We are a local motorcycle/powersports shop and we recently lost 50% of our Google traffic on our main company website on 5/5/11. I have read on the panda 2.1 update(some call it) and it looks like some people were affected on that date as well. The only thing I can think of that might cause this is that we have 2 smaller sites, which we had prior to the company website. These 2 sites have the same content as 2 of 8 sections of the main company site. I'm thinking possibly 301 the smaller sites to the same pages on the main company site and do a reinclusion request? Any comments would be appreciated.