This are "some" (5282) bases with runways for Orbiter 2010 P1.
This files are automatic generated from the open street map project (see www.openstreetmap.org)
The xml sourcefiles are also avarible here: http://orbithangar.com/searchid.php?ID=5107, for the case, someone fill advance the parser tool.
Please note:
It is possible to activate all this bases in Orbiter, but under some conditions, Orbiter got some problems, for example, if you try to select a base on the map mfd.
Existing runways may be overlaped by the texture of the generated runway,
so for example, you should delete the "Shuttle Landing Facillity.cfg" before starting Orbiter.
The runways / bases are not looking verry well, i hope it's ok for the first try;-)
But i hope for base developers, they can be usefull.
[edit]An osm XML export can be found here:http://orbithangar.com/searchid.php?ID=5107
You can find the Eclipse project used to generate this files including sources here:http://www.orbithangar.com/searchid.php?ID=5114