AlyssaS - 3:47 am on Feb 25, 2011 (gmt 0)
We produce 100% unique content on our site and always have. We use all white-hat techniques, and our site just got trashed in the rankings... We've been at the top of years and now we've fallen big time. It is very frustrating.
Check your links. Even if they are unsolicited natural links, if they've been monetising with Adsense and are in any way "general" or personal blog sites that yak about everything under the sun, they could have been taken out. If the sites linking to you have been devalued, then your site will drop too, even if it is pure white hat with good content.