So I have this one hostgator reseller with roughly 30 acai berry/diet sites on it. I'd say they are mostly grey hat sites with a few autoblogs mixed in, mostly unique content though. Linking has been shady. I believe now that my ip block/nameservers are penalized by Google for one of the reasons. None of the sites seem to get any hits at all from Google anymore, yet some used to. My question is do I just leave these on the block they are on and hope to continue to pick up msn/yahoo leads or should I spilt these up on 8-10 new servers and hope Google picks them back up? I guess my real question is if these domains are now "permanently tainted"?