IPv6's major implementation problem is going to be apathy. After all, things are working fine at the moment, and who cares that some day there might be a big ip address crunch?

Nick

FYI: http://dc.internet.com/news/article.php/2221821 June 13, 2003 Pentagon Commits to IPv6 By Roy Mark The Pentagon announced Friday it is beginning a transition Internet Protocol Version 6 (Ipv6) to bring the Department of Defense (DoD) closer to its goal of net-centric warfare and operations. The new protocol will facilitate integration of the essential elements of DoD's global information grid, including its sensors, weapons, platforms, information and people.