The IPv4 address space has been exhausted. While you can still get IPv4 address, the will come from organisations that already allocated them from IANA.
I mean come on, my new fangled dual core Tegra2 gtab can't do IPv6 and my iPhone 3gs can? Suck.
But seriously, I would really like to have ipv6 support in vegan rom. I'm working on some prototype hardware that has ipv6 web servers that I would like to access from my gtab.
BTW - My hardware is a $5 microprocessor with a full ipv6 tcp/ip stack on a 6LoWPAN (low speed/power wireless ipv6) serving up web pages. Eventually I'll be able to control my lights and feed the cats with them. </geekout>