60 actual.
Steam counts 72 however.
That includes three Civ 4 Add-Ons, which also double up with their Mac Versions. (+7 games, including Mac version of base game)
Then there's the Ship Tutorial, which I don't count since it definitely shouldn't need to be it's own individual game.
Also the Arma 2 Op:Arrowhead Beta, and the Arma 2 DayZ Mod.
That brings me to 70 games that Steam counts.
I'm not sure where those extra 2 come from.
