So this sort of thing always has me ripping my hair out in frustration.
This is a great bundle, it's a great deal, it's still totally worth it even if the only game out of the bundle that is playable on OS X is Sims 3.
Come on! I'd still totally throw some money at this, just so i can have these games in my steam library, and play em on someone else's windows machine. But what a downer. Sigh... At least we have HL2 and Portal.