In the beginning of this year Geonames.org has released a new Service called Geotree. This service structure Country information and other spatial information in a tree view, which can be accessed together with a map. Currently (March 2008) version 1.2 is available, including features like CSV Export, different languages, capitals and random view.
All locations can be visualized using major web based base map services like Map24, Google Maps, Yahoo Maps, Microsoft, Openlayer, Openstreetmaps, etc.
The service can be seen under http://geotree.geonames.org/
License: Open Source GPLv3
Written and submitted from Home, using my 802.11g WiFi network.
