Can't Quit Apps
Windows 8 introduces the concept of full-screen apps (as shown here in IE). Unfortunately, once an app is running it's not always obvious how quit it. The usual keystrokes such as ALT-F4 don't always work, and navigation controls (as seen here along the bottom) only appear when moving the mouse down or poking the bottom of the screen on a touch system. I'm still trying to figure out how to quit Piano, an app that opened on its own and keeps restarting along with the OS. This is a sour note, to be sure, and IT will hate it.