IPv6 Internals by Iljitsch van Beijnum
This article discusses some of the protocol details you should be aware of when planning a transition from IPv4 to IPv6. Although it is not intended as a complete step-by-step guide, this article explains the differences between IPv4 and IPv6 as they relate to actually operating a network. Vendor-and operating system specific details can be found in the book from which this text was adapted, and further information is available in the references.
http://cisco.com/web/about/ac123/ac147/archived_issues/ipj_9-3/ipv6_internals.html