Sure thing timyo, I'm happy for any of the techniques in the examples to be used in commercial products <img src="smileys/smiley1.gif" border="0" align="middle" /> Credit not required, but appreciated.
This applies to the game graphics included as well (unless they have a separate usage permission assigned in their respective folders).
The full game source files and resources (in the "Games" subfolder), are free for learning purposes/non-commercial works. Credit is again optional, but commercial use is currently not permitted of those exact files.
I hadn't thought of this question and updated the blog page with this information, thanks!