Hello again
3D tagging is a lot of work. I started in Graz, now I tag my home village, Wendhausen. Some results are liste in here already. Now there is a bigger discussion about 3D tags in the forum: http://forum.openstreetmap.org/viewtopic.php?id=19952 (german) http://forum.openstreetmap.org/viewforum.php?id=42 (general)
And the video I made from my tag results visualized with OSM2World in a virtual 3D environement (cAVE): http://forum.openstreetmap.org/viewtopic.php?id=20012 Video: http://aceini.no-ip.info/video/osm/OSM.avi
Amiga4000