First of all, you can't prove a negative so trying to prove that something doesn't exist is a waste of time.
The world is round with plenty of proof (far too much to put in one post) but examples include photos from space and that the North Star is only visible from the northern hemisphere. This proof is of course not accepted as anything other than fabrications and false by the FES but with no evidence to back up those FE views it does not invalidate the proof of a round world.
While there are many proofs that the earth is round there is an appalling lack of proof to support the FET. It seems that other theories are being bused in an attempt to bolster the FET (Ex: the bendy light theory), but you can not truly support one theory with another. This is not to say that some haven't tried to supply experiments and other information as evidence but it falls short of the support needed to bring the FET out of the theory stage.
@ Ichimaru Gin: Claiming victory because no one posts what you want is like going outside and yelling Santa Claus exists, not having any of the passersby contradict you and claiming Santa is real based on that. Your time would be better spent with fewer flippant and useless remarks and more searching for something, anything that would help support the FET.
@ Tom Bishop : Claiming that those who believe in a round earth can't produce a model because there isn't one, based on the lack of a post, is no more a valid statement than if there were a nuclear physicist, who does not reply to a post asking for a valid model of a nuclear reaction indicating that such a model doesn't exist.
As with any theory, it is up to those proponents to prove that their theory is more than just a theory. To those actually on the course and working hard to prove the FET whether it is ultimately possible or not, I salute you for making the effort. For those who sit back and come up with theories without trying to validate them and to those who sit at their computers waiting to make flippant, useless posts, why are you wasting your time?