Currently MS released an interesting framework for building games for personal computers and xbox systems simultanously. Masters of abbreviations are working hundreds of hours for getting XNA := XNA’s Not Acronymed as THE recursive abbreviation. — How has this invented, eh? — Not the Swiss!
Since August, 30th the Game Studio Express Beta is available for download — you may try it out here.
However, you can read another interesting story about the abbreviation XNA. In this scope XNA is the abbreviation for the IATA airport code of the US American Northwest Arkansas Regional Airport in Fayetteville/Springdale, Arkansas.
Additional information: You MUST HAVE installed a Visual Studio 2005 C# Express version on your computer to use XNA. The existence of the traditional Visual Studio does not matter, curious.