Even if Apple does not start shipping two button mice, I am glad that they do have contextual menus accessible from a right mouse button (or cmd-click). For instance, I always right-click to create a new folder. Shift-cmd-N is much more of a pain in the ass, escpecially since my hand is almost always on my mouse when I want to create a new folder, since I probably had to click to get where I wanted.
OTOH, in the Application folder, I almost always use the keyboard to find what I want (by pressing the first letter of the App I want, using the arrow keys to select the app and hit cmd-o
As for the scroll wheel, yes, grabbing a document and pulling it along can be nice, but I prefer a scroll wheel, particularly with macrumors.com. There is less things involved with repetitive movement using the scroll wheel as compared to moving your wrist around to drag a page. I use a computer all day long, want to avoid RSI.
Go Apple, add preference support for multiple button and scroll wheels to the mouse control panel. Logitech makes my favorite mouse, but the driver options are pretty sad.