An Introduction to IPv6
Playboy writes "Here is a great introduction to IPv6 in general, the technological background, the reasons for the move and the effects this will have on networks. Understandable for network novices like me but still includes many details on the technological side of things."
He's passed on (hence the joke, I get it) but in his TCP/IP Illustrated books, he discusses IPv6 thoroughly, including how to write applications to use either protocol seamlessly.
Dozens of /8s are available; last time I checked it was about 40% of the total address space.