The latest Rao et. al. article is available free on PNAS:
A Markov model of the Indus Script
Rao et al.
http://www.pnas.org/content/early/2009/08/04/0906237106.full.pdf+html
Regards,
Paul Kekai Manansala
Quests of the Dragon and Bird Clan
http://sambali.blogspot.com