The most exciting feature of the Evo is the 4.3" screen. It's something you're going to use everyday for pretty much anything you do on the phone. It's also the perfect size. Still pocketable, but BIG.
I remember looking at my Creative Zen Vision media player when I first got it, and thinking "man this thing would be an AWESOME phone". It had a 3.7" 640x40 screen, and TV out through composite cables.
The Evo is a dream come true.