deadsea - 10:27 am on Jun 11, 2012 (gmt 0)
I have a site where users also come for data. A calculator of sorts, you fill in some data and get calculations and answers. I haven't been hit by panda, but I was hit by the "too many ads above the fold" algo. At this point, I believe it is because Googlebot thinks that my only content above the fold is the ad. I don't believe that it thinks that the calculation form is content at all. The only text I have on the page is well below the fold. There are no images to speak of.
It is unfortunate, but Google does not appear to consider non-mainstream site concepts like these when designing there algorithms.