walkman - 6:57 am on Jun 5, 2011 (gmt 0)
I personally believe that they were manually white-listed for Panda. Google denies that they were hit by Panda but it would not look good for them if they admitted it. Nevertheless, one thing is clear: there's no way for them to have fixed and come back in a few days. For one, it takes Google quite a while just to index tens of thousands of pages.
Two sites i.e. DI and cultofmac were initially picked by panda but were dropped later on.It does suggest that they had signals for panda to trap them but they probably removed those signals later on. It could have been done with some help, though they may not obviously share them, without requiring google to make exceptions for them.