CO.CC site provide free domain and DNS Service for everyone who wanna have own free domains. you can create your own site with co.cc and also can mapping your blogger, window live and google apps with co.cc.
As we have noticed that 6 months ago, Google delisted all sites on a co.cc domain name. Google delisted .co.cc subdomain due to spamming and low quality.
As i saw that today co.cc domian back to google. If you have co.cc domain, it’s good news for you. now your site came on google and rank as well.