Author of PageKite here - funny to see this reposted yet again. :-) In case anyone has any comments/questions/... we're listening.
Also, if you haven't checked out PageKite in a while, the most recent 0.5 release fixes a lot of minor issues the older versions had, it may be worth another look, especially if folks are using Windows or aren't based in "the west" (we recently deployed a relay server in Asia, in addition to our American and European relays).
FYI: In Firefox 17 on Snow Leopard there's a "skip to navigation" link way to the right (like 10000px or so) that I can scroll sideways to on your homepage. I only noticed because I'm using a trackpad. :D
http://pagekite.net/wiki/Floss/FreedomAndPrivacy/ is what motivates me - PageKite is an attempt to bootstrap a peer-to-peer web where IP addresses don't matter anymore and servers can run literally anywhere, so people can actually self-host content at home without learning all about IP addresses, routers, firewalls, DNS, SSL, ...
I don't know how much bigger that is than your vision, since I can only guess what your vision is. :-) I can guess based on your design, that until now you haven't cared much about people using localtunnel for anything except dev testing.