[quote=Steam] http://www.l4d.com/blog/images/posts/065/mac.jpg
Today we make it official, Left 4 Dead and Left 4 Dead 2 on the Mac. Check out the update page for full details.
Once “The Sacrifice” is released this Tuesday, the Left 4 Dead team will celebrate by playing Left 4 Dead 1 and 2 all day. If you want to join us in a game, on the Xbox 360 look for L4D2 DEV 1, L4D2 DEV 2, L4D2 DEV 3, L4D2 DEV 4, or L4D2 DEV 5. On the PC L4D2_DEV_1, L4D2_DEV_2, L4D2_DEV_3,
