We think Apple's Magic Trackpad marks the beginning of the end for Mac OS X. Other reviewers of the Magic Trackpad touched on other subjects.
MacWorld: Apple’s new Magic Trackpad lets you perform Multi-Touch gestures on desktop Macs. Like the Magic Mouse, the Magic Trackpad’s system preference pane includes video demonstrations of how to perform each gesture.
Engadget: Apple's Magic Trackpad isn't the first of its kind -- in fact, Wacom has been playing this game for awhile -- but it's the first of its kind from the cats in Cupertino, so obviously people take notice.