Smartphones running on Microsoft's Windows Phone 7 operating system have been on the market for several months. Like other smartphone platforms, Windows Phone 7 provides a marketplace for apps, games and other downloads. The Windows Phone Marketplace is a venue for consumers to obtain music, video content, podcasts, and third-party applications. Some of these products come with a reasonable fee, but one can also acquire some awesome apps free of charge. Let's look at the best free Windows Phone 7 apps offered at Microsoft's application market.