It also means that Mac players will be able to play on the same servers as the PC players. To celebrate the launch, gamers can pick-up Left 4 Dead for $9.99 (50% off) or bundled with Left 4 Dead 2 for the low, low price of $14.99--though not as low as the previous sale.
Left 4 Dead 2 has been available on the Mac since the launch of "The Sacrifice" DLC. All Left 4 Dead and Left 4 Dead 2 DLC is included for free on the PC because Valve is like that.
I enjoy L4D1 more anywho, the weapons are simpler, and no silly melee weapons which always seem to get me in more trouble than they be worth yo.