I'm applying the "be bold" principle from Wikipedia, hopefully that flies here and I'm not disturbing anybody in the community.
I'm going to draw out areas for all 52 neighborhoods in Cincinnati. As best I can tell, the neighborhoods are currently each represented by a single node "place:borough" in roughly the center of the neighborhood. This might work well for some cities, but Cincinnati's neighborhoods are objective and have defined borders (even if some borders are disputed). So we can definitely make things more accurate!
I've never really done anything on OpenStreetMap before, but I'm really excited to dive in. So please stop me if I'm doing something wrong!
I plan to draw the area using shared nodes from streets, waterways, parks, and other existing features. There are probably very few neighborhood lines in Cincinnati that don't follow physical objects or property lines. I'll tag sources as I go, and I'll also add population data, community websites, Wikipedia articles, and other accompanying information whenever possible.
So far I've done my home neighborhood of Camp Washington. It went better than I expected. Still getting used to this browser-based editor, but I don't think I'm committing any serious errors.