WMAP microwave sky image
A spherical mapping would be a nice background for EarthBrowser
Images courtesy of the NASA/WMAP Science Team
There are a number of microwave bands that could be used (K, Ka, Q, V, W). Now I just need to find the time to reproject them and, the hard part, put in a selection interface. Things like this will be so much easier to add to version 3.
Thanks to ccablog for the find!