A while back, I wrote a blog post explaining how to localize the title of a Windows Phone game. That blog post includes a link to the Windows Phone 7 Title Localizer tool that can be used to quickly create native resource DLLs with localized versions of the game’s title. A couple of days ago, the creator of this tool released an update so it can now be used to create native resource DLLs for the new Windows Phone Mango languages.
You can find more information about the tool at http://patrickgetzmann.wordpress.com/wp7-localize/. You can find a list of steps to localize the title of your Windows Phone game using this tool in this blog post.