Google Earth v4.0 Beta Build 2693

Want to know more about a specific location? Dive right in — Google Earth combines satellite imagery, maps and the power of Google Search to put the world’s geographic information at your fingertips.Release notes:
Progress indicator for loading network links and models
Real-time GPS tracking using NMEA (Plus, Pro and EC)
Greatly improved performance for collada models (textured buildings)
Tours can display balloons (Tools->Options… then "Touring" tab)
Driving directions and touring allow a greater range for typed values
Mac movie-maker supports many more compression formats

KML notes:
Icon palettes are deprecated (no more root:// for the styles)
Improved performance on network link hierarchies

Major fixes since last beta:
Improved compatibility on shared memory architecture ATI graphics cards with older graphics card drivers
Improved success rate of log in over unreliable connections
Fixed offline mode in Pro
Numerous GPS fixes (including GPX import)

Download: Google Earth v4.0 Beta Build 2693 (Freeware)
Homepage: Google Earth