A great 3D Earth viewer for Blue Marble and more (Score 1)

Try out GeoFusion's GeoPlayer at http://www.geoplayer.com/gateways. It is an web enabled control running in a web page. Only runs in PC/Internet Explorer although they say more platforms coming. You can animate via a slider through the Blue Marble monthly images and fly around with the mouse (the help button will explain mouse navigation).

The streaming is quite fast (with a good connection) and there are other "gateways" to high resolution Katrina and Tsunami damage imagery. Mars too.