Cliff Medling and Aidan in collaboration made a video embedded below, specifically for SketchUp modelers. It shows how to use 3DVIA Scenes to explore an imported SketchUp model by walking around inside it. The killer app is a feature that lets multiple people explore the same model simultaneously as avatars. SketchUp's Walk Tool offers a similar, first-person experience, but having the model online and accessible to anyone with a web connection is enormously powerful.
Two things: Cliff tells that Mac compatibility for 3DVIA Scenes is on its way. Also, the clever folks over at Dassault have built an iOS app (for Apple mobile devices) that lets you view and interact with models you've uploaded to 3DVIA.com. Since COLLADA (.dae) is one of the formats they accept, you can use these apps to view SketchUp models, too. 3D everywhere!
[Source: SketchUp Blog]