ESRI shapefiles
From World Wind Wiki
ESRI shapfiles or shapefiles are a common format for storing GIS related information. Basic shapefile support is included with World Wind.
Adding shapefiles to World Wind
Adding shapfiles to World Wind is currently a simple manual process. A user interface will be added in a future version of World Wind.
In your main World Wind folder (eg C:\Program Files\NASA\World Wind 1.3\) there is a folder named ShapeFiles. You must create an xml file for your shapefile in that folder. Your shapefile files go in a folder beneath that.
Complete documention is still being written, however it's a simple process and you can use these sample shapefiles to get an idea of how it works.
