Zynga released a lotto website, connected to their games. Sign up, scratch off a ticket, win a prize of your choice from their games (mafia wars, petville, etc.)

http://lotto.zynga.com/

Mafia Wars Prizes are:

Set 1
Bolo Knife
Set 2
Protective Shirt
Set 3
Yeti Snow Cruiser
Set 4
Jackal