This is an elaboration of my post 'Interactive Web Based Model Viewing - Part Uno' - it looks at using the Autodesk Seek Viewer to view Revit models online - here is the original post.
It was a little tricky to get this to embed into my blog but I think I got it workable. By now, you should have already been prompted to run the Autodesk Seek Viewer add on and you should be able to see the model in the viewing window. If not, here is the direct link to the Autodesk Seek Viewer; just extract the .zip file and run the .exe file.
This example is using one of the sample projects from RAC 2011. As you can see this can be quite a valuable and lightweight tool. Right click in the viewing window somewhere and you can view the various settings and tools you have to play with - I especially like the Interactive Slicer.
Go ahead - have at it! It works very similiar to Revit as in panning, zooming, etc.