Windows Phone 7 is now available at AT&T and T-Mobile retailers across the US. As of today, WinP7 customers in launch markets around the world already have access to nearly 2,000 apps and games -- exceeding the 1,000 mark set in early October. Also that Marketplace is fully open to submissions from any of our 13,000 registered developers in the 30 supported markets.
And, starting today Microsoft Advertising's in-app "ad solution" for WP7 is available and serving ads in the U.S., helping developers earn more revenue by making integrating ads easy and providing reporting that leverages the industry's first real-time, bid mobile ad exchange.
More Info: Ad Solution for Windows Phone 7