Today morning i was very happy when i saw a news that Apple has finally rolled Mountain Lion today. I was waiting for the same since they announced the operating system. Well, now what i want to know is how much is it going to cost me and what are the system requirements for the same. It will be really very appreciated if you guys can also give a short tutorial about how can i upgrade my system to 10.8 Mountain lion. At present am running with Snow leopard 10.7 on Macbook. Thanks in advance.