Thank you all for your answers.
The wsj link is here:
http://blogs.wsj.com/developments/2008/01/16/why-baby-boomer
The yale publication is by Prof Shiller--(i misspelt the name, sorry) and is titled Long-Term Perspectives on the Current Boom in Home Prices by Robert J Shiller
I can't attach it here but I think it can be got by a web search--there are repositories you can transfer the file from.
A summary of this paper is here:
http://www.sanfranciscosentinel.com/?p=1546&ref=patrick.net - Wed Mar 12 2008, 19:11