Not sure if its completely working yet, but I was wondering if you could walk me through how the new portal command works. I was fiddling around with it a bit to no success.
You can make a portal at your position with a radius r by typing /setportal <name> r. It will register you as standing in that portal if you are within r blocks of where you were standing when you typed the command. Standing in a portal doesn't do anything unless it is linked to another portal. To link one portal to another portal you need to type /linkportals <portal1> <portal2>. This will link portal1 to portal2 and vice versa.
There is also /portals which gives you a list of portals and /delportal <portal> which will delete a portal.
Oooh I see, very cool