First time posting on the forums but I thought I would like to let people know that valve is handing out free keys for Dota 2 via their Dota 2 Dispenser on steam. Its a pretty simple process. Just have to add the dispenser to your friends list, message it ''give dota'' without the quotes and you should receive it as a gift within seconds.

http://steamcommunity.com/id/dota2bot