This was a lot of fun to be involved with, hope everyone enjoys it as much as we enjoyed being in it.
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SilverSprite doesn't require XNA to be installed, but as for the rest, I would agree that Xbox is a major focus for XNA, and there are some good reasons you might not want to use it for Windows, like the fairly subtantial prerequisites. I don't feel, however, that XNA for Windows gets shortchanged unless you want to use DX10 features in your game or integrate it into another application.