I first heard of KeyHole during one of Microsoft’s presentation of Avalon (which is Longhorn’s presentation subsystem). Keyhole is the 3D digital earth pioneer—the only company to deliver a 3D digital model of the entire earth via the Internet. Keyhole’s groundbreaking EarthStream™ technology combines advanced 3D graphics and network streaming innovations to produce a high performance system that runs on standard PC’s and commodity servers. Both high performance and intuitive to use, Keyhole’s solutions enable anyone to manipulate a rich map of the earth composed of imagery and feature information. Check them out at http://www.keyhole.com/.