From the "dean" of RAD University:

The current version of IP (IP version 4) has been extremely successful, allowing global internetworking as we know it today.  It is the limited address space that is the primary motivation for IPv6.  Other motivations include new Internet applications that will benefit from the added features.  Though none of us has a crystal ball, and we have seen many protocols fizzle out, though when first appearing they held great promise for the future, it appears that it is worth paying attention to IPv6.   This portal links to several projects that can assist you in gaining familiarity with IPv6.  

IPv6 Tutorial
IPv6 Addresses
IPv6 Autoconfiguration
Path MTU Discovery is mandatory for IPv6
ICMPv6
IPv6 over Non-Broadcast Multiple Access
Setting Up an IPv6 LAN

You will also find that several of our other tutorials, for example, DNS, include IPv6 issues in the discussion.
We hope you find these tutorials useful and we welcome your comments.

Debby Koren
radu@rad.com