What Mac do you have? ARe you sure that your Mac has built-in Bluetooth support? From what I know, Bluetooth is like USB. It's pretty much standard on anything, Macs or PCs. Beyond that, it's up to the Bluetooth device manufacturer to provide software for the Mac or Windows if it's needed.
As far as I know, any USB two-button mouse that works on the PC will work on a Mac with USB ports or a PCI USB card (if it's a much older pre-USB Mac with PCI slots). What's even better is that Mac OS X will support multi-button mice right out of the OS so you'll have your contextual menus available with a right-click...no more control-clicking.
