I just read the emiT Time blog and I was curious if we were to already know about successful signals sent back in time like the BA mentions, does that mean the future has already happened? If not, then when we get to the near future and the expirement was successful, would we have an instant knowledge? And if not, are there theories that time is on different plains, that is, there are an infinited number of indivindual instances in our past?

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"...and that brings up Parkman, who's batting just over .900 against Vaughn." ~ Major League II

John Cramer is the physicist behind this stunt; he also writes for Analog on speculative science issues. His essays on wormholes are very inspirational if you are trying (like me) to write hardish science fiction and other speculative nonsense.
This is an index of his columns; plenty of interesting stuff to be mined there.
http://www.npl.washington.edu/AV/

Cramer has also refined the Transactional Interpretation of quantum interaction, based on stuff by Wheeler and Feynman; this is probably the basis of his latest experiment. It is all beyond me, but I note that he says that he thinks it probably won't work.

As far as I can understand it the Transactional Interpretation does seem to imply that the future already exists; how this can be squared with the unpredictable nature of the Uncertainty Principle I can't begin to guess.

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This is easy. Its called fiction.

My question, astromark,was more about theory than the actual success of these expirements.

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"...and that brings up Parkman, who's batting just over .900 against Vaughn." ~ Major League II

In every entanglement experiment I've seen, it's not actually possible to use the entanglement to communicate faster than light or backward in time (which are effectively equivalent), even though it can be made clear from the results that entangled particles must exhibit supeluminal influence on each other. That influence always ends up disguised by quantum randomness. I don't expect that this experiment would be any different.

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Conserve energy. Commute with the Hamiltonian.