I would really like to see similar graphics for Europe, Asia, Australia, and Canada. I don't know where to get the data though, and I don't think I could make such a beautiful visualisation as he did.
http://www.demographia.com/dhi.pdf
The top 10 least affordable with respect to median price/income ratios:
China Hong Kong 18.1
Australia Sydney, NSW, 12.2
Canada Vancouver, BC 11.8
N.Z. Auckland 10.0
U.S. San Jose, CA 9.6
Australia Melbourne, VIC 9.5
U.S. Honolulu, HI 9.4
U.S. Los Angeles, CA 9.3
U.S. San Francisco, CA 9.2
U.K. Bournemouth & Dorset 8.9