As you might (or might not) know openstreetmap aims to provide a free (as in speech) map of the world. You can help by adding or editing the map. This is what I have been doing the last couple of months. Mostly fixing roads or adding new cycleways. Now of course cycling is good exercise. And it feels good to contribute to a free world map. However the real kick is seeing your changes of your work!

This can be seen on the main website. However that is only updated once a week. There are several other tile servers that serve a part of the map. These servers are generally updated more often. However when you use a tile server you are can’t change the rendering. So how great would it be to create your own rendering?

Check out my wiki entry. Of course it is a wiki so add all improvement you can think of.