Well, this is a marketing technique with some positive momentum (or is that aggressiveness.) Microsoft has put up a demo of the Windows Phone 7 UI that you can load into your browser on an iPhone or an Android phone. If your are on the fence and thinking of switching and you want to get something of a feel for how Windows Phone 7 works this might be worth your time.
The url to enter ishttp://aka.ms/wpdemo. Load it up and you can swipe and tap through the demo.