I performed an Export to X3D on some of the blend files in the Blender guru architecture tutorials. You can view and navigate through architecture models in 3D in a web page at this site.
http://dl.dropbox.com/u/5095342/Xj3DApplet/rc1_pack200/X3DArchitecture.html
Just click on one of the images of an architecture model and the 3D model will load into the web page. Left click and drag your mouse to navigate through the 3D model. You can view the blender guru architecture tutorials here.
http://www.blenderguru.com/category/tutorials/monthly-specials/architecture/