On April 24 one of my sites SERPs dropped for the majority of its keywords and have not recovered since. About 30 keywords dropped from page 1 to page 2-6, they have profile, web 2.0., bookmark and article links. About 5 keywords remained on first page, dropping only a couple spots. They have the most diverse link profiles compared to the ones that dropped. Couple days before the drop I had an AMR blast with about 300 livelinks to 2 inner pages. Those 2 inner pages are the worst hit, at position 85 and 120. Why it doesn't seem to be a dance is because there is no movement for the keywords. I was also able to bring new keywords to page 1 fairly quickly during this time, but the dropped keywords didn't move at all. About Panda.. the date is different and the site has 100% unique content. I have built thousands of links since the drop (not spammy), but no change. Site is 1,5 years old. There are no on-site issues. So my question is have you experienced anything like this and what else can I do to bring those keywords/pages back?