I just came across the below shown promo by Microsoft, to enter the contest click on this link https://microsoft.promo.eprize.com/windowsphone7/?affiliateid=zunemarketplace. This promo is open only to the residents of the 50 U.S. Districts including District of Columbia. As mentioned on the site, Enter between October 27 and December 1 and Tweet for a chance to win a Windows Phone 7. So all my dear friends in the US, enter the contest for a chance to win a Windows Phone 7.