This paper talks about how to identify when the housing prices may be out of equilibrium. Has tons of data from a few decades. May help to compare 1980's to today.
This paper talks about housing wealth and how it differs from financal wealth. It has data from many different parts of the world. It has a few charts and graphs.
A modified Google search engine that just searches within academic resources. This way one can avoid pulling up links to non-scholastic sources (like online discussions bereft of supporting data).
This article gives facts and figures on social networking. this article also breaks down some individual sites to see how they have advanced since the past years.