As you know Microsoft has launched its Windows phone 7 which will first debut on AT&T /T-Mobile and later to Verizon and Sprint. Check out the following link on more information on Windows Mobile 7

http://www.microsoft.com/windowsphone/en-us/features/default.aspx

There are currently 5 models that are being released by various verndors

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx