World Wind: Open Source Google Earth?

World Wind is by no means as full-featured as Google Earth, but if you just want to play Atlas and spin the world around, it's a good option. To install under Linux, look for worldwind in the software channels, but the java version of the software runs on any platform. Best thing about it is that the software is open source and the imagery is not owned and copyrighted by [insert giant corporation here]. There are some nice Java webstart demos here too: http://worldwind.arc.nasa.gov/java/demos/ showing things like loading .kml files, mapping elevations, annotations, geo-mapped photos, earthquake information etc.