Free SketchUp 3D Model Viewer (with Some Fun Stereoscopic Magic)
Mirye Software is giving away Shade 3D Browser, which is a fast and fun presentation tool for viewing (zooming, panning, etc) SketchUp and Shade models. The fun part is if you have an NVIDIA 3D Vision set up (card, monitor, glasses), which means the models are rendered with some great stereoscopic effects.
The only bummer is that its Windows only. It is accelerated with DirectX (no OpenGL option - yet).