I was trying out the new version of Google Earth, and noticed that All Saints Church now appears in 3D, if you enable the “3D Buildings” option. The Dome is also modelled, as is the London Eye, and other famous landmarks. It looks fairly simple to add your own models, using Google’s free Sketch Up software… I had a quick go at creating a 3D version of The Railway pub, as it is a simple shape – It needs a lot of improvement, but you get the general idea:
Try downloading the software, and perhaps between us, we can create the whole of Blackheath in 3D! Also, if you’re into planetary things, you must try the new Mars model inside Google Earth. See here for more info.