I've been playing with the SketchUp Web Exporter. Not a clear science yet, but some great possibilities to embed '3d' models into web pages.
First try is here... and when I have more time I've found a hack on the web to get the interiors to work.
Click and hold once the image loads - and move the mouse right and left to rotate the structure. It gets choppy in Firefox and seems to work glitch free in IE and Chrome.