Well, Paynterboi TicTacToe wrote this nice introductory tutorial for C++:
http://www.darkgdk.us/index.php?page=6
If your looking for some good C++ tutorials, check out the ones at C++.com
http://www.cplusplus.com/doc/tutorial/
And for DarkGDK, take a look at the ones that came with DarkGDK (check Start > All Programs > The Game Creators > Dark GDK > Tutorials). You could also learn some DarkBASIC Pro and then "translate" it into the DarkGDK equivalent functions.
http://www.darkgdk.us/ <- You can now submit pages, upload images, yet were lacking content. We need your help!