For quite some time, I'm contributing to OpenStreetMap. Mostly covering areas where I live or I know well, but sometime I randomly update areas where I travel as well. The one important bit was always missing for me - nice frontend to render many of hidden features.
Now this space seems to be slowly filled in by map1.eu. This quite new project (first announcement has been two weeks ago) renders quite nice maps for Europe. The map is primarily intended for hiking or cycling, so it includes things like hiking routes or cycle routes. In Czech republic we have quite great maps on mapy.cz, but I don't know anything what covers whole Europe.
The project still has some issues, but is progressing nicely as you can see in today's announcement of 0.2 release (in Czech). Of course you can help, either by code or by money, which is needed to run rendering servers.
