Interesting presentation by Marc Heuse at Hack in the Box 2012: bugs in IPv6 implementations, differences between IPv4 and IPv6 filtering by large websites, discovering IPv6 systems without brute force address scanning. Did you know that on 63% of networks the ::1 address replies to pings on at least one subnet? And then the hacker security researcher knows which subnets are live.

Video at Youtube (64 minutes).

Slides.