Brandon Carroll has recently launched MyIPv6Tutor.com, an e-learning program targeted at engineers that want to learn IPv6 basics at their own pace. I know Brandon is an excellent instructor, so there are at least four IPv6 training options I can wholeheartedly recommend.
Working for a Service Provider? You’ll find all the intricate details of deploying your IPv6 core and providing IPv6 to your enterprise and residential customers in my Building Service Provider IPv6 Core webinar (buy a recording or yearly subscription).
Last but definitely not least, if you need in-depth knowledge of major Cisco IOS IPv6 features, take the weeklong IPv6 Fundamentals, Design, and Deployment v3.0 course.