I sense a procedural issue here. A tangle of definitions based on the assumption of uniqueness of our human function.
From the perspective of a social scientist, there is indeed an excellent model of consciousness. William James expressed the operation of the mind with what has been termed a "constellar theory of meanings", which later was picked up by semanticists such as Benjamin Whorf, Edward Sapir and S I Hayakawa. This model simply sayus that the knowledge in our heads is a holism in which every definition occurs by cross reference with every other definition. Of these, a few also have direct attachment to sensations. These sensations define the nature of the actor, and the collection of definitions descrbes the actor's life space. Creativity can be reduced to (and has been experiemntally demonstrated to be) concatenation of prior data into complexions (that is, the set of all sets, or "power set" if you prefer) which leads to projection of the prior state, such as E(h), into a new cross-space, curl E(h), followed by focussing on useful correlates in the projected state. This repeats indefintely, and ultimately, given eternity, spans all possible states of mind. (For a more formal treatment see: Armentrout, D (1988). Growth of technical knowledge. Proceedings of the University of Pittsburgh 19th Annual Conference on Simulation and Modelling.
19 :305-11. Research Triangle Park, NC: ISA.) For science, about 95% of the variance is typically explained at the .001 level or better.
Phrased differently, this is nothing new. We usually say that we try to "put the loose ends together to come up with understanding", which is all there is to it. I just like the way it looks with all the Greek symbols etc.

That model of mind has nothing in particular to do with either our spiritual nature, nor with ESP. It simply tells us that as we age we grow in wisdom and understanding. In light of this kind of thinking, ESP is merely another channel for input.
What we really lack is a good definition of ESP. It's a trash-can definition. "If nothing else can explain it, then we'll toss it into the bin labeled ESP." Thus, meditation that accesses the spirit world, hypnotic regressions into past lives and the spirit world, the activities of mediums and channeles everywhere, plus our own insights developed through our personal forms of yoga and prayer, and everything else that is other than obviously material cause and effect is ESP.
Coming back to Bruce's points, this definition of ESP forces us to conclude that there is no material proof of the stuff that ESP brings us. There can't be. That's because we have defined it away.
What we have in place of logical proofs is a huge series of inexplicable events. Children born with knowledge of debts and obligations of the parents and grandparents in India. Not very uncommon.
We also have, as Rei points out in another thread, "faith-healing" that has been proven effective by several investigators. And occasionally we have direct personal experiences with stuck souls, or entities that are hitching a ride with other people, and so on. And we also have personal experiences brought about through meditation, into which category I'd place NDEs, although the meditation is forced on the actor in the same manner as is the ultimate meditation of death. And we have OBE experiences as well, which includes a large number of hospital surgeries in which the actor's awareness moved here and there throughout the room, and often through the rest of the building.
The interested investigator will also encounter frauds of all types, psychotics, junkies, and material hedonists who offer nothing but objections and criticism, and who are the strongest supporters of a purely material world that rejects all other phenomena. Their posture is supported, not by specific "white crow" types of evidence, but by the fact that all phenomena of this world must fit into a material scheme, as well as other transcendental ways of being. That, plus denial, the most primiive defense, keeps these people happy in their hedonic activities, and hides from them the rest of the possible experiences of life.
I suggest that ESP is the essence of the entire situation with which we are dealing. It includes, by virtue of generality, everything other than the material world. And, after a lot of work by dedicated researchers at Duke and elsewhere, there is good statistical evidence that there is "something" that alows this unusual mode of communication. Adn we have generations of prophets of various degree and competency who have written essentially identical treatises on the topic, suggesting that it has some degree of interpersonal consistency.
So superficially, we do, in fact, have a pretty fair model of where we are and what we're doing. We just haven't figured out how it works yet. Like Bruce, I'm quite interested in a gizmo that would communicate with the spirit world, but I lack a way to connect the material world to the spiritual, because the spiritual state still eludes analysis in a manner that involves extended physical states.
Personally, the one hint I have for further investigation, is that spooks tend to get caught up in electrical phenomena, making lights blink, phones ring, and recorders capture voices - and my rare OBEs have often led me to get caught up on an electrical wire over a street. Snoopy and I briefly discussed high impedance antennas in this regard, but without a better model, what would such a sensor physically look like? I'm open to the quest, but it looks like we need some more data to concatenate.
dave