Buttons & Wheels
I, too, am one of the many devoted Apple fans who just can't live without a 2-button mouse, and yes, even the scroll wheel. Why Apple won't just give in is a mystery to me. Perhaps it's to keep with the stubborn "very, very simple" philosophy. Or maybe it's because they don't want to copy anything Microsoft did, although I think that after all Microsoft has done, it's about time Apple copy something of theirs.
But alas, Apple is in charge. As soon as I ordered my new QuickSilver, I also ordered a Kensington USB Mouse-In-The-Box, 2-button scroll mouse ($15!). And I couldn't be happier with it. Scrolling is natively supported in OS X, but with Kensington's software, you can control scroll speed, and assign your buttons. The scroll wheel acts as a third button, and a "chord" (pressing the two buttons at the same time) acts as a fourth. So my right button control-clicks, which is beyond intuitive. My scroll button double-clicks, and by chording, I option-double-click, which I've found is the handiest of options. Chord on the desktop, and you hide whatever application was active (just like if you hold down the option key and click the desktop). The double-click part of it is for navigating through the Finder. By chording, I open folders in a new window, and close the one behind. Very, very slick!
Scrolling works very smoothly in OS X, and is supported in (almost?) all applications and even the Finder. I would reccomend it to anyone who wants to maximize productivity... or anyone who's got a lazy left hand.
