Seems like more and more sites are springing up with Digg like interfaces - Dell is doing it and now a site called HomeHugg does it with houses. I can't seem to get it to work for any areas near where I live - but it's a beta, after all.
According to the marketing material on the homepage of HomeHugg:
"….HomeHugg is a community of Home Buyers, Realtors and Lenders that help each other discover, save and share their favorite homes for sale or rent in their community. The members of HomeHugg are able to add homes, comment on homes, map their favorites and share them with their family and friends. "
I would not mind seeing a Digg like interface for house plans as well - at least then you'd get feedback to know what people are responding to.
