Some Left4Dead mac action and bonuses for the rest of us

I never got on the zombie bandwagon for L4D 2, but I had some good times with the first one and was saddened that it moved to number 2 so quickly.  Looks like our friends and family starving for games on the Mac will get a crack at the first one as well as a new full campaign for both versions of the game for free.  SOLD.