1. They fixed the alt+tab interface - you can actually see what you're switching between, and the desktop is one of the options. (The aero windows button+tab is even better; much better even than expose on the Mac).
2. The start menu. Hit the windows button, type the name of the program you want, hit enter. Don't need to touch the mouse, don't need to navigate countless inscrutable menus organized by the name of the software publisher.