The Dixon Homes website could be improved in many ways, but one that I think would be very interesting would be to provide 3D model downloads of their house designs in Google SketchUp format. It would allow people to get a good look inside the houses as they really appear rather than just the plans in the brochures. It seems very likely that some designers or architects would have thought of something like this before (possibly a Flash application hosted in the web browser) but sometimes a download to manipulate on your own machine is better.
Mokalus of Borg
PS - I did a very shallow search for builders offering this exact service.
PPS - I didn't find any, but as I said, the search was shallow.