I was recently looking at games available on the Mac App Store and my favorite discovery so far is Sailboat Championship.
The game lets you control a small sailboat using simple controls. It's fast and fun. It's also hard, which lets you appreciate your improvement, including racing against a "ghost" view of your previous run.
It's also available for iPhones, so find it in either app store.
Within the first five minutes of a conversation with another most people already have it set in their minds, whether this person knows what they are talking about, or is a raving idiot - Alexander Munro[quote database]