Button Test results in OSX using the driver found here:

http://tattiebogle.net/index.php/ProjectRoot/Xbox360Controller/OsxDriver#toc11


Controller

X-Axis : Left stick
Y-Axis : Left Stick
X-Rotation : Right Stick
Y-Rotation : Right Stick
Button #1 :A
Button #2 :B
Button #3 :X
Button #4 :Y
Button #5 :Left Shoulder
Button #6 :Right Shoulder
Button #7 :Left Stick button
Button #8 :Right Stick button
Button #9 :Start
Button #10 :Back
Button #11 :Guide
Button #12 :D-Pad Up
Button #13 :D-Pad Down
Button #14 :D-Pad Left
Button #15 :D-Pad Right
Z-Axis : Left Trigger
Z-Rotation : Right Trigger