If you are a closet uni-mouse-button user, you can try your hand at making a game in 30 days, using the Unity games tool ( from what I hear, an excellent tool for making games on Mac ( UI is Mac only ) that can be viewed online by both Mac and PC users )
http://www.idevgames.com/forum/showthread.php?t=13168
Hopefully these guys see the error of their ways, and create a PC editor also – it looks like a great technology.
Mal