Steam for Mac-can you use a Xbox controller?

[Imola Ghost]

I'm not much of a gamer but since I travel a lot I wanted to try out the program for my 13" MBP. I runs very good on it but I'd like to know if you can use a Xbox 360 controller to play any of these games.

 

[ltldrummerboy]

If you install this driver and if the game supports it.