[OSM-talk] mapping hypotheticals with OSM, e.g., for public charrettes?

[Tom Roche]

How best to use OSM to "map" non-existent features for planning
purposes, e.g., for public charrettes? (Apologies if this is a FAQ, but
a brief search of

http://wiki.openstreetmap.org/wiki/FAQ

and of the lists via

http://www.google.com/custom?sa=Google+Search&domains=lists.openstreetmap.org&sitesearch=lists.openstreetmap.org

found nothing I wanted, which may be due to poor search terms.) The NC
GIS list was just queried for

> a Mapping Program that will allow users to map out specific places,
> routes, and areas for such things as Planning Charrettes, Surveys, or
> any other method of getting citizen's input more interactively?

Another lister immediately suggested OSM, as do I, but I'm unsure how
best to do prospective or hypothetical mapping.

Your assistance is appreciated, Tom Roche <Tom_Roche at pobox.com>