mhansen - 10:20 pm on Dec 16, 2012 (gmt 0)
have you been able to recover a page from panda or penguin by a simple URL change on the same domain?
In our case, we tried 301-ing the old url > new url on a few pages, and also tried letting the old url 404, then after it was gone from Google (1-2 weeks, using the site:domain.tld command) we recreated a new page with the same content.
Neither method worked for recovering a page from the effects of our own "April 24th" loss.
Also as a result, we lost search traffic from engines other than Google to those pages as well.
Do the old-pages still rank well in alternate search engines that use Google results? (Like FoxStart)