I finally figured out (when all I had to do was to search...) that apart from the 'kerplunk' of the main switch, the clicks coming from my Mighty Mouse wasn't from a mechanical action but via a speaker. One of the things I've had problems with regarding the Mighty Mouse is that the side buttons seemed ludicrously sensitive. You only have to brush them to get a click, and for a long time I was mystified because I was sure I wasn't pressing the buttons in hard enough to create any kind of mechnical click. Do other people have problems with over-sensitive side buttons, especially the right one? Is this a warranty issue over can it be overcome with soft/firmware?