Microsoft published today the RTM of Windows Phone 7.1 SDK (aka Mango). If you already used the RC version to publish your app, there is no need to recompile or resubmit your application on the Marketplace. And as I said yesterday, if you want to make money with your applications, you can now use the Microsoft Advertising SDK which is included in this SDK in 11 more countries.
So, do you see any reason to not develop for Windows Phone 7 Mango???