I really enjoy your blog, in particular the posts on collision detection and physics engines. In fact looking for collision detection tips was what brought me

I really enjoy your blog, in particular the posts on collision detection and physics engines. In fact looking for collision detection tips was what brought me to your site in the first place. Personally, I would like to see posts on things that you need in non-trivial games such as scene-graphs, path finding or R-trees. I may not be the audience you are aiming for, but I find you can explain things quite well, and when people are looking for ways to implement these things, they may be willing to pay for working code that's thoroughly explained.