Amidst rumours of Macs finally getting a first-party two button mouse I ended up at this page which, somehow, does a rather good job of justifying Apple’s one button mouse habit. I guess you never can underestimate the stupidity of users. The problem here is of course that us power users feel restricted - even when you get a 2+ button mouse I don’t believe OS  X particularly supports it (i.e. with wheel scrolling throughout and context menus) but I’m happy for Mac heads to tell me otherwise.