Maybe the push towards DNSSEC will sweep IPv6 along with it.. we can't afford not to have either of these things, and both require some significant maintenance work - why not roll out both at the same time? Maybe DNSSEC should only support IPv6?
If you want to get into a discussion then let me know and I'll pitch some thoughts at you, but wanted to introduce you to the subject first, in case you hadn't already looked into it.
My favourite startup (if you could still call it that) is Telnic (British). I think the .tel TLD will be revolutionary, but has so far received surprisingly little attention from tech/entrepreneurial communities like this one and TechCrunch - perhaps because it's not in the Valley? I guess this might change when it launches next week, or on March 24th when general availability begins..
Yeah the main problem is buying the actual numbers. We don't have a very complex requirement in terms of managing the calls - they'll all just get forwarded on to different numbers, so we don't really need to manage our own infrastructure.