We've been running out of IPV4 address and needing to convert someday soon for the last 10 years..., but yet the vast majority of broadband providers and even most ISP's don't support it yet.
You've got another couple of months. I believe most U.S. network providers have agreed to a 'flag day' sometime in June 2012.
Internal networks / backbones at Comcast and Verizon have been IPv6 for some time now. At least that is what a credible little bird told me.