yes, the cube gets 'em..
3: A uniform compositor should be used
Big fan of the compositor too. It's probably the most useful and fun part of the Linux experience for me. Nothing beats the look on a Windows user's face when they see the cube in action for the first time.
I've said the same many times. Just yesterday I deployed a shiny new KDE machine in an office. The person I was training saw the cube switch, and was amazed. She ducked out and dragged a bunch of coworkers in to see it. (a few of them weren't as impressed)
I'm a fan of compositing, too. I firmly believe making the environment fun and pleasing to use is a huge plus on the productivity side.