I just finished Odom's CCIE Routing and Switching Cert Guide for the second time. However, after all that, I know my weak areas are still IPv6 and Multicast. I don't "like" the topics (prolly cause the environments I've worked in didn't use either), and that no doubt had an impact on my understanding and ability to retain.
So, I would appreciate any resources you champs have come across for those two topics. Even better if they were pdf's or online links. Yes, I can google with the best of them... but if you tech gods have any hidden gems, you know I'd appreciate it.