3D map example in an area with lots more detail about buildings
http://map.f4-group.com/#lon=8.8073256lat=53.0758799zoom=18camera.theta=49.315camera.phi=-167.2
For those unable to see it, I have found a screenshot online:
http://www.servimg.com/image_preview.php?i=27u=13208997
Other 3d projects
One for the mappa-mercia website:
http://map.f4-group.com/#lon=-168401lat=6874255zoom=19
P.s. This is a 3d web gl render of OSM including working fountains,
flowing water, rain, and building heights/roofs (if tagged). I would
imagine it needs an up to date browser (not IE6!) to view it.