@Night: "not based on NAT"
I'm afraid it's going to be a long time before that happens.
"IPv6 via tunnel."
http://www.google.com/intl/en/ipv6/faq.html#tunnel
Depends on if you want to run in an environment you're not comfortable with, IPv6 doesn't need to be used for a few more years atleast. Lets wait for Windows. 8?