Update 1.5: August, 2nd, 2013 - I will be updating this to a working teleportdetecter based on a method mentioned and one that I preferred to do, although I've discovered that the same method can be used to detect stucks (ever been stuck on the top of a tree?, infinite looping?) by using this same method but in reverse.
on the stucks, it would use hearthstone because I've found some places where even a normal person couldn't get out of without using hearthstone, just need to test it a lot more... running 24/7 atm in a stuck friendly area (won't get reported by players).
on teleport, it would kill wow and reloggers.