Apple has recently release a new version of their mouse that has a total of four buttons and a tiny ball in replacement of the scroll wheel.
So the almighty Apple finally admits that a mouse needs more than one button. Haha. This reminds me of the time when I was talking to my dearest (she's a Mac user) about the need of the right button found on a normal typical PC mouse. So she asked the infamous question that all Mac users asks when confronted with this "Why would I need the right mouse button?". To which I tried to explain to her all the functions of the right mouse button but she just simply do not see its need.
Then she buys an iBook for herself and the funny distributor she bought it from gave her a Microsoft mouse with the 'right' mouse button. After using it to help her install some stuffs on her iBook, she started using it herself. And then, while she was working, (her workplace uses Macs), she actually complained that her mouse there does not have the right mouse button. Hee.