louieramos - 2:57 am on Sep 2, 2011 (gmt 0)
I am currently dealing with the same problem with one of my client, they have about 25K pages of newsletters. A couple of months ago, they were on Page 1 for a high traffic finance keyword, then they dropped to page 5 and stuck there. (After a Panda rollout)
One of the solution we are trying is to leave all the posts (newsletter pages) but remove all of the links to it from any of the main pages. The only posts that will have links are the latest ones (2 weeks old). The reason for this is because this is exactly what the Top 1 site is doing who have exactly the same format. We'll see how we goes. But I will be following this thread for other possible solutions.