Yay, the Demo for Mafia II has just been released.
Love the first game, if you do too, then go and get it: steam://install/50280
If not, or just haven't played it, then try it out anyways, should become a great game.
Full game will be released on 24th/27th this month: http://store.steampowered.com/app/50130/
*downloads*