The XNA Team Blog hosts the release details of XNA Game Studio 2 which they released on the 13th December - just in time for you to play with over the Christmas Holidays!
I have enjoyed time playing several games on my 360 over recent days and I must say that my thoughts have been turning to dusting off my development skills and writing some simple apps myself though I'm unlikely to need many of advanced features of Game Studio 2 for some time to come! You can download it for yourself here.
Game Studio gives you a development environment for building both 360 AND Windows games in C#
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