Norwegian search engine Sesam just launched a 3D map service (plugin needed – Windows only for now) which can be used to view a map of Oslo in 3D. It is based on aerial photos taken at a low altitude, and uses Scandinavian technology all the way (from the Swedish JAS project where the underlying technology was used to guide missiles, to the Norwegian 3D company myVR Software).
If you have ever wanted to see the Opera offices in glorious 3D, here's Opera Software's HQ in Oslo, and you can even see our logo on the wall:
Yes, the construction site to the left is that construction site 🙂
A Mac version of the service is expected in Q1 2009, while Linux support is coming in Q2 2009.