SDS (Separate Data Store) is a great solution for this problem The arhitecture includes one separate server (link to github repository<https://github.com/geofabrik/sds-server>) and a JOSM plugin. With the plugin you can add private tags to existing ways and nodes. The tags are stored on your server and are linked to osm objects.
The announcement and a short description on josm mailing list<http://lists.openstreetmap.org/pipermail/josm-dev/2012-March/006099.html> . Unfortunately, I can't find the plugin in JOSM right now, but that is probably a temporary problem. Janko Mihelić
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