The World Wind Geo is an experimental geo browser built on top of two of the best open source technologies:

1. World Wind Java SDK - http://worldwind.arc.nasa.gov/java/ : Allows developers can embed World Wind technology in their own applications.
2. Eclipse - http://www.eclipse.org/ : Eclipse is an open source community whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes.

For more information see: http://code.google.com/p/worldwindrcp/