Various resources quote Vint Cerf in initiative to raise awareness of running out of unallocated IPv4 adresses by 2012. It is time to get on to IPv6, however change from IP4 to IP6 is not trivial technologically. Social implications are even greater.
The full text of the book An Introduction to Internet Governance (6th edition) is available here. The translated versions in Serbian/BCS, French, Spanish, Arabic, Russian, Chinese, and Portuguese are also available for download.