FrostyMug - 1:35 am on Apr 2, 2012 (gmt 0)
I've been posting here too. I too saw a big decline on January 19. I moved all the offending top-heavy ads about five days later. I also modified content heavily to move it to the top of the page. My site has been up for a very long time, never affected by panda.
I got too greedy with AdSense suggestions for three ads on each page.
Since January 19 I have not seen any changes in ranking. They're still at 50% of original traffic. I think the algorithm has not been rerun. Otherwise we all would see changes to the sites.
I had three ads on each page. Long banner on top, one square ad, and a footer. I Wiped all but the middle ad and moved it to below the fold.