Redirecting your way out of a google penalty
If your site has been peanalized by google it is possible to evade the penalty by 301 redirecting the old domain to a new one.
Supose your site has a sitewide penalty and you’ve tried everythign to fix it but to no avail. I guess all your hard link building efforts are wasted. Butby purchasing a new domain or using an old domain you can redirect your old penalized domain to a new one, hence restoring your old rankings.
The downside of this method is that is will take many months before your old rankings are completely restored. First google has to replace the old domain with the new one and then the new domain has to get out of the sandbox, BUT it will have no penalties attached to it. And all your pagerankis transfered to the new domain, too.