It is nearly impossible to get people to download and install software, I know from experience. Even Google Earth is only installed on a few million computers. Installing software or browser plugins is not allowed in most corporate and government environments. If you want to display geospatial content on your website and not exclude most users, your only choice until now has been flat maps.
The first example of the EarthBrowser Flash plugin is up at earthbrowser.com with a simple interface that gives a hint at what is in the desktop AIR application and an easy way to download and install it. Download the free trial AIR app and take a look at all the great features. Chip in a few bucks if you like it and want to support my efforts to provide an alternative to the multi-billion dollar behemoths out there.
I haven't mentioned it yet since I've not blogged in a while, but EarthBrowser did not win at the Adobe MAX show. Scrapblog won, they have a pretty cool app with a very well defined and active niche. It was a great experience and I met some really cool people. By the way, Ben Forta is *way* more impressive in person than his blog picture suggests.