OpenStreetMap
landuse=residential classifications: There are several different that could fall under this... single-family, townhomes, apartments, high-rise apts/condos, mobile homes, etc.
A clearer definition of the difference between landuse=commercial, =retail and =industrial. Lots of offices are considered in zoning as 'light industrial' and called 'industrial parks', as opposed to 'heavy industrial', traditional industry with smokestacks and factories.
Fraternal lodges/meeting halls: Still lots of these around, though many of them are quite old, not just the buildings, but the average age of the members.
Discussion
Comment from Zverik on 16 May 2011 at 06:18
We have residential=*, for example, in Russia we use residential=rural and residential=urban. The same can be made up for other landuses. There is no 'official' in OSM, only what you create.
Comment from Minh Nguyen on 16 May 2011 at 06:32
I’ve been tagging fraternal lodges with amenity=social_club. There’s also amenity=public_hall, amenity=social_centre, and building=hall for similar facilities.