Six months ago, Google publicly wiped out any co.cc domain from showing in Google's search results. That subdomain wide penalty seems to have now beenlifted.
A search for [site:co.cc] returns over a 100 million results now:
The results started appearing about ten days ago, when before, it returned nothing:
I am not sure if Google changed their mind of this penalty was automatically lifted after a certain time period? Who knows...