It looks like ESRI is releasing ArcGIS Explorer 900, just in time for WhereCamp5280. Some new features include:

• New UI (the Office ribbon)
• New basemap galley for easy access to different base maps
• 2D/3D <- What I think really sets AGX apart from other globes. It is a 2D world out there!
• Better KML support and support for layer packages (becomes a viewer for proprietary ESRI data0
• New presentation mode (if you saw Bern demo this at the UC, you know how valuable that will be)
• Bing Maps free to ArcGIS Desktop users (if you have ArcGIS Desktop license with Bing, you can use that on AGX)
• Localization
• Projections! Who says you have to work in mercator
• .NET SDK

AGX has come a very long way so if you haven’t tried it in a while you’ll want to give it another shot. One thing I did note, it doesn’t run on Windows 7 very well. Might be me, but I’ll see Bern tomorrow and ask him about it (though I can guess his answer, “We’ll support it when Windows 7 ships”)