diffinsight:

IPv6 Header cheat sheet (via http://packetlife.net/media/library/8/IPv6.pdf)

more some detail version

here : http://www.roesen.org/files/ipv6_cheat_sheet.pdf

much better version

here : http://ipv6.co.hu/wp-content/uploads/2012/04/IPv6-Cheat-Sheet.pdf