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There are many tutorials that cover OpenGL and various other libraries, along with tutorials that cover the basics of C, but there are very few approachable examples of actual games that one could study.
I by no means claim that this game is ideal from that perspective, but there's not a whole lot of abstraction to wade through, and it's relatively well organized ( ... I think - Any opinions to the contrary would be welcomed, of course ).
You can get the source code here: https://github.com/GoranM/wtetris
Also, if anyone has any specific questions relating to the code, or the design choices I made, feel free to ask.