library documentationXNA Game Studio 4.0https://web.archive.org/web/20181013080440/http://xbox.create.msdn.com/en-US/education/documentation/
Writing Game Codehttps://web.archive.org/web/20160610075153/https://msdn.microsoft.com/library/bb198548.aspx
XNA Framework Class Libraryhttps://web.archive.org/web/20160817123911/https://msdn.microsoft.com/en-us/library/bb203940.aspx
Content Pipeline Class Libraryhttps://web.archive.org/web/20160825221154/https://msdn.microsoft.com/en-us/library/bb195587.aspx
Detecting Xbox 360 Controller Button Presses (Xbox 360, Windows)https://web.archive.org/web/20131006175231/http://msdn.microsoft.com/en-us/library/bb203900.aspx
How the Frostbite Engine Became a Nightmare for EA in General, and BioWare in Particularhttps://www.usgamer.net/articles/ea-frostbite-engine-history-bioware-ea-sports
I hope someone can start adding to this thread, it appears to be useful for many users, I am walking away for a while, sorry and thanks.
Unfortunately many XNA sites have gone down recently, If you know any, please do list them here and I can check to see if the wayback machine has cached them, er or you could also do that and link those sites....