NeHe Productions: Main Page. RB Whitaker's Wiki: XNA Tutorials. Welcome to the XNA Tutorials, the largest and easiest to use collection of XNA 4.0 tutorials on the Internet!
There are plenty of other sites out there, but as far as I know they are either much smaller than this, or way out of date, which is a big deal, since so much changed in version 4.0. You may also find my MonoGame tutorials of interest. MonoGame is an open source port of XNA that runs on a very wide variety of programs, and may ultimately have a longer lifespan than XNA. About These XNA Tutorials XNA is an extremely powerful and easy to use set of tools for game making, created by Microsoft. C# & XNA Learning Reference.