Windows Phone 7 will be hitting the markets sometime in October, however, several lucky people have been able to get their hands on Windows Phone 7 devices.
Pocket Now who have an Windows Phone 7 based phone in their possession have created a video comparing the home screen between an iPhone and Windows Phone 7. WP7 has a dynamic home screen which contains tiles which update regularly, so you can access and view updates from Facebook and Twitter from your home page.
Pocket Now also compares the play controls which allow you to play audio even while you are using another program. Take a look at the video comparison between an iPhone and Windows Phone 7.