Microsoft officially launched the Windows Phone 7 OS yesterday. They announced 10 phones from HTC, Dell, LG and Samsung. Three of those phones use AMOLED displays: the Samsung Focus (with a 4" Super-AMOLED (leaked back in July as the Cetus), the Samsung Omnia 7 (with the same 4" Super-AMOLED display) and the Dell Venue Pro (leaked back in April as the Lightning).
There were reports that Microsoft expects most WP7 phones to have AMOLED displays, and even designed the UI so it'll suit those displays (with black background to conserve power). It's great to see that even today, with AMOLED supply issues, 3 out of 10 WP7 phones use AMOLED displays.