A newer version of EarthDesk is available.Or, Learn More About EarthDesk
Full user review
"Makes your Mac desktop into a space station window"
Well supported - had a problem with upgrading to 5.5 (PPC) version. E-mailed and problem promptly sorted in half-an-hour.
None really - There was a charge for upgrading from 4.x to 5.x but well worth it
Cheaper than a $40 million Soyuz flight to keep track of the what's happening on earth!