Windows 8 gets rid of the Start button for a “hot corner” approach – peg your mouse cursor to the lower-left corner of the screen and you get access to the “Start screen.” It actually works pretty well, and is easier / quicker to reliably “hit” than the old start button. Likewise, the lower corner provides access to search and other options.
But say you have more than one monitor?
If you have two – it’s not really so bad. As long as the main display is the one to the left, and your second display is to the right – the right-side corners are easier to hit (Especially since there is actually a button on the right side)
But suppose you have three? And suppose you want your primary display to be in the middle. Suddenly the hot corners become unusable. Presently there is no solution that makes all corners work well, but you can at least get your lower-left “start” corner working better with a little “nudge”:
In your monitor setup, bump the side monitors up just a tad (you can click and drag to reposition them). The consequence of this is that windows that span monitors will not line up, but at least you can actually hit the start corner…
I would argue that in many ways the Windows 8 Consumer Preview does a decent job of integrating the touch and mouse input methods… as long as you only use one screen. But seriously, who does that anymore?