The image above shows the current state of the map for Stuttgart. It's still missing a lot of information including many of the major roads, mostly because I don't drive here. There were also very few streets in the centre of town until this weekend when I made a conscious effort to go in and collect data for some of the pedestrian areas of the city.
If you're in Stuttgart and interested in helping out with mapping, get in touch. There is GPS data appearing in the area from someone driving around, which acts as a good base for some of the major roads, so if that's you, get in touch and maybe we can work together to make sure they're tagged with street names and the like.