One problem with the SDL is that it doesn't come with any kind of GUI. Most games require something and Empire is no exception, so the next two or three Empire tutorials starting with the one I've just published will be on developing a SDL GUI.
See if you agree or disagree with the list of controls I've suggested. Now, there's some interesting development ahead of me! This GUI code will be generic, not just for the Empire game.
- Read more about game tutorials in the Games Programming articles.