The Google SketchUp Web Exporter (Beta) allows you to enable a simple interactive view of your model for any web page without a browser plugin. This is an early release intended for web developers who are interested in adding dynamic 3D content to their website, or are interested in an example from which to start writing their own interaction for the browser.
Equirements: The plugin works only on the PC, but the results are cross-platform and cross-browser.