More reasons to rejoice for WP7 developers and more proof of growing importance of Windows Phone platform. Google has release AdMob Windows Phone 7 SDK (in beta right now) using which Windows Phone developers can integrate Google Mobile Ads into their applications. AdMob joins Microsoft Advertising SDK and Millennial Media in offering SDK for WP developers.

New beta AdMob Windows Phone 7 SDK expands cross-platform monetization options for developers

With the Windows Phone 7 SDK, developers can easily integrate advertising into their applications, control where the ads appear, and what types of ads are shown in their apps. The SDK supports text and banner ads with a variety of post click actions including opening a webpage and linking directly to the App Marketplace.

We have also taken steps to customize the ad experience for the look and feel of the Windows Phone 7 platform and make it easy for users to return to their application after engaging with the ad. Publishers can download the new SDK today by logging into their AdMob account and adding a site type of Windows Phone 7.