I have finally found the time to finish a new tutorial for XNADevelopment.com. In this tutorial I cover creating an RTS style selection box using a single image. This was a fun little project and I've only done one of many ways this effect can be achieved. I tried to make the code very simple and readable so that most beginners should be able to tackle this exercise. I've also included a "One Step Further" project, where I took the SelectionBox source code and enhanced it so that you can select "units"...