lewis1 - 11:35 pm on Dec 19, 2012 (gmt 0)
Just to throw in my 2 cents...
I tried what Planet13 was asking on a Panda and Penguin hit site. The new pages didn't rank at all after changing some file names.
I then moved the site to another domain, jiggled a few things about and rankings for the site were returned and held strong through the last Panda update. Just waiting to see when Penguin hits again to see if it's going to survive that one too. My theory is that it will as I haven't used a normal domain redirect.