The latest release of the driver includes support, and I'll be updating the USB information section of this website shortly.
I have got the Microsoft ChatPad working with my wired controller. I have however been informed that 64-bit and 32-bit builds are both working. It also contains 64-bit binaries, however I've been unable to test them because Apple have disabled my MacBook from booting into 64-bit mode.
I've released a version which will hopefully install and work fine on 32-bit Snow Leopard. I have created a USB driver which allows you to use wired XBox 360 Controllers via USB, and wireless XBox 360 Controllers via the Microsoft Wireless Gaming Receiver for Windows, on your OSX machine, including support for the Apple Force Feedback library.
