Greg Sadetsky of Poly9 demonstrated FreeEarth, a 3D web based globe like Google Earth.  Difference from Google Earth: It lives on the web.  No download...no install.   It uses Flex/Flash.  Check out a live app built with it called Wild Sanctuary. It was built by Poly9 and 30 Proof.  Wild Sanctuary showcases the Free Earth Globe integrated with very interesting soundscape information and sound clips.

Other highlights:

GeoAlert: Emergency alerting system.  Built on their FreeEarth platform.  Does automated emergency alerts with some geoprocessing, including plume modeling, automated selection and notification of residents in the plume area etc.  Very cool application with real value.

MapMakr:  Bringing map making to every day business users using open source tools.  Developing robust web-based map creation tools.  Launch is scheduled for Summer 2008.