The document summarizes the opportunities for developers on the Windows Phone platform. It notes that Windows Phone 7.5 provides a modern mobile experience using common development tools like .NET and XNA. The Windows Phone app ecosystem is growing rapidly with over 65,000 apps after just one year, yet remains less saturated than other platforms, allowing apps to stand out. The marketplace review process is transparent and fair. Developing for Windows Phone allows leveraging existing skills and porting apps from other platforms using provided guidance.