(Probably) The easiest way to get map tile for NASA's world wind with natural earth data

Converting from the natural earth data raster images to NASA's World Wind tile is a bit complicated.
I guess one of the easiest way is use the demo program in goworldwind.org.

How to:
(1) Get the script named "InstallImageryAndElevationsDemo" and launch it.
(2) "Install" the tiff image of the natural earth data.
(3) check the directory "c:\programdata\worldwindinstalled" on Windows.
      (Probably you can do the same thing on the other plat forms)

URL:
http://goworldwind.org/demos/