I have two sites that got -50 last september, over 6 months ago. I have been mostly waiting to see if those sites just come back, but no result. Now I have bought new domains (other one is new EMD, other is EMD with hyphen) and transferred content (almost identical). Other one I have 301 redirected few days ago, other one I did today. Other one (EMD) is allready ranking #5 for its 3 most targeted KW's (total of 5000 Exact, 2.5?) and few other rankings on 1st page and 2nd page. Still waiting for other one to get indexed. What I did for first one to get indexed was just pinging, adding it to some local blog directories, relevant forums and just few social signals (facebook/twitter/g+1). Both have diversified linking strategy going on. Now I'm just hoping rankings will stick and penalty will not get transferred. But as of now, it seems like this method works for getting out of -50. 1) Buy new domain. 2) Transfer content. 3) 301 redirect. 4) Build some manual "white hat" links and get social 5) Rank again! Will report what happens next weeks/months.