The simplicity of the Windows Phone UI continues to intrigue me. I've spent months customizing the Start Screen design into this.
I am one of the few who own a Samsung ATIV Odyssey. It does what I need it to but otherwise a locked contract until a year February is going to be painstaking. The functionality and app-optimization on our platform is still a long ways from where it would have to be to draw a larger crowd of users; and to satisfy me in particular. While the marketplace IS growing exponentially, developers are not incorporating the features of live tile, lock screen, and detailed status.
I'm curious what the upcoming versions will implement and or change. Let's hope for some things exciting!