I've just returned from a place where the streets really do have no name; nor do most of the houses. They don't have postcodes either. That place is County Galway, Ireland.

I have no idea how the post office / taxi / delivery drivers / ambulance / police / fire brigades function where the best you have to go on is a name, and the nearest village.

Actually, taxi drivers ask for directions, and frequently will call up the destination on the phone and ask for directions.

Anyway, since a large OSM contingient seems to be converging on the west of Ireland, I'm sure there will be a quick debate on how to tag the fact that a residential street really does have no name, something better than name=none