Where's a good place to learn about IPv6?

I've mostly got my head around IPv4 these days, and my ISP still only has an unsupported 6rd gateway which I've tried with momentary success on my router.

I understand that the address space is 128 bits vs 32, that successive colons mean 0000 between them, that devices can have "local" and "global" scoped addresses, and it's supposed to do away with NAT... but that's about as far as I've gotten :)

A server I lease overseas has an IPv6 address block assigned to it, and I'm struggling to figure out how I'm supposed to assign a reverse DNS to it, so Google and friends don't flag it for the MTA not having a reverse lookup (for now, I just lock it to IPv4)... I figured I might as well learn more about how it works, different to IPv4..

Any practical pointers?