www.marinetraffic.com tracks the locations ships equipped with an Automatic Identification System (AIS) transponder, which is now required for ships over 299 gross tons. The data for presented for each ship includes:
Name of ship and flag Type of ship Speed and course Photo of the ship Link to further details about the ship
A huge database that shows the details of aircraft in flight visible in Google Earth. The database is constantly updated as new imagery is added and new aircraft are located. As of the date of this post, there are over 3,000 aircraft identified.
Google Earth BBS [...]
The Open Street Map project is a collaborative effort to map the entire globe. A global atlas created by users. This file will overlay the Open Street Map project onto Google Earth.
The detail of the maps increases as you zoom in to show the names and locations of neighborhood streets.
The Demis Wold Map overlays a global map on to Google Earth. The map appears to have highway-level detail for much of the world and increases in detail as you zoom in. I believe Demis offers other versions of this map with more detail at their website.
A Google Maps version is also [...]
This placemark collection contains data for approximately 70,000 bridges throughout the United States derived from the 2006 National Bridge Inventory Database. This placemark collection only contains information on bridges with a status of “Structurally Deficient”. For a better understanding of the data, I suggest reading Coding Guide for the Structure Inventory and Appraisal of [...]