Update 5/03/2013 ~ I am noticing a lot of people are finding this website via Googling if Co.CC is going to return. Sadly I doubt it is going to come back at all.
For those with a better memory than a goldfish on crack, a year or so back I wrote an article about Co.cc and how you can use them with email and I also did a Co.cc referral review but it seems as of today they might have pulled the plug.
For those that may not know, Co.CC was a free subdomain service that gave you a subdomain (like snat.co.cc) and then gave you full DNS access so you could use it as you would a normal domain and the service worked great – even I used them for a few throwaway domains but that is where the problem came in.