Jim Rossignol at RPS mentions the upcoming game Overgrowth from Wolfire Games, the sequel to Lugaru.
Overgrowth seems to be quite an unsusual game - some sort of post apocalyptic setting with ninja rabbits and the requisite conspiracy. But serious!
I was pleasantly surprised to see there is not only a Windows version but a Mac and Linux one too.
The truth is, the Mac game came before the Windows or Linux game.