I'm a long time videogame racer (Trackmania FTW!) and recently fell in love with this game. There is quite a large community on steam all talking about this game in the forums there where I have posted these tracks already, but I wanted to make them available here too.
To the developer, you have this game on Steam (millions of people!!!) yet you seem to ignore it. This is ready to take off just show some support at the forums, put out a few updates, do a free weekend, 50% sale, and finally MULTIPLAYER and you might be amazed what happens. Still a great game! Thanks and feel free to include any of these maps in any future updates if you like.