Lego Mindstorm NXT documentation

Are there more detailed specifications on the Mindstorm NXT? In working with NeXT Byte Codes, I would like to better understand the interface to the
various components. Any links would be appreciated.
Joe
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According to a Lego Press release, Lego will be releaseing an SDK for the main software in August
see press release
http://mindstorms.lego.com/press/2057/Open%20Source%20Announcement.aspx
-David
Frank Jones wrote:

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The NXT documentation was released today. You can find it at:
http://mindstorms.lego.com/Overview/NXTreme.aspx
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