To win an iPod Touch, tweet or re-tweet a message containing #rummikubiphone. You can tweet as often as you like, every message containing #rummikubiphone counts.
To win the Macbook Pro, just include a picture in your #rummikubiphone tweet of you with Rummikub for iPhone in action.
There is no definite deadline. Contest ends when reaches 10,000 followers for the iPod Touch and 25,000 followers for the Macbook Pro.