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What I did was make a subdomain which content wise is different but is optimized for generally the same keywords. After adding links to it from the www site and a couple of others it almost immediatly had the same page rank and google positions.
What will happen when the penalty is removed or reviewed or whatever is supposed to happen after 6 months or so. Will both sites be penalized will the original remain as supplimental or will both have ranking. And if the worst could happen what should I do to fix it.
If the original site does come back (don't be so sure it will happen), and ranks, then I would consider moving the subdomain to a new site via 301. It's nice to have two sites ranking!