I'm interested in experimenting with IPv6 at some point. Since most of the operating systems I use in my lab have IPv6 stacks, I plan to run a native IPv6 VLAN internally. I'm also interested in connectivity to other IPv6-enabled sites.
This OpenBSD Journal article offers a few options for people wanting to use IPv6 across the IPv4 Internet. I plan to try one of these solutions and post my results here in the future.