One of my side projects for OpenStreetMap mapping is the mapping of public transport routes in the New York region. This consists of New York City Subways (Map), Manhattan Bus Routes (Map), several Queens Bus Routes (Map) and Staten Island Bus Routes (Map). You can now view most local bus routes on the transport map and quickly locate nearby routes without navigation the maze of most local transit authorities websites.
The remaining items on the lists are several cross-town services, Bronx services and transportation on the New Jersey side. On a side note, an alternative rendering of the public transport map can be found at OpenPTMap, where subway lines are also rendered properly.