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Nasa's open source World Wind 1.4 was released --

NASA World Wind

World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.

I listed the features below, but better to check out Bull's Rambles --

Bull's rambles: NASA World Wind 1.4 released

awesome! The weather overlays look incredible. Now to go free up 1.5 GB of disk space

Feature/Fixes IN 1.4
==========================

* Plugin: Movie Recorder removed
* Plugin: KML importer updated
* Plugin: Place Finder Loader (Supports more geocoders)
* Plugin: New WMS importer with GetCapabilities support
* Plugin: Atmospheric halo replaced with sky gradient
* Plugin: Waving Flags (3D version of the flags of the world add-on)
* Plugin: GPS Tracker added
* Plugin: Anagglyph 3D added (true 3D using Red/Blue glasses)
* Data: New NRL data
* Data: Boundaries served by WMS
* Data: WFS placenames
* Core: Added what's new in 1.4 page to configuration wizard
* Core: New accurate sunshading
* Core: Support for 3D models
* Core: Atmosphere (Improved with atmospheric scattering)
* Core: Added widget support
* Core: Internal HTML Browser
* Core: Camera shakes/jitters/jumps fixed
* Widget: New scalebar
* Widget: Time controller
* Widget: 3D compass widget
* Installer: Removed background
* Installer: Mars, Moon, SDSS icons removed
* Installer: .Net 2.0 check
* Installer: Added command line tags NODOTNET, /NODX, /NOMDX) to skip detection of .NET, DirectX 9.0c, and Managed DirectX, to skip checks respectively.