Tiny House Blog
I was searching for pallets and came upon the "Tiny House Blog". With the post about micro houses I thought you would enjoy the many links he has. A wealth of information. I also ran a search on Tiny House Blog and came up with dozens of sites specifically about small homes. In the past a search for small homes was primarily real estate ads, so this was a huge and welcomed surprise.
Here is a link that might be useful: Tiny House