I have been reading William James' book Pragmatism and came across a really interesting passage. I post it here because I can't recall its being used in the ID debate before. Back in 1904, James anticipates some issues about the identity of the designer. This is from Lecture III, entitled "Some Metaphysical Problems Pragmatically Considered," and is quoted from the Project Gutenberg version of the text:

Let me pass to a very cognate philosophic problem, the QUESTION of DESIGN IN NATURE. God's existence has from time immemorial been held to be proved by certain natural facts. Many facts appear as if expressly designed in view of one another. Thus the woodpecker's bill, tongue, feet, tail, etc., fit him wondrously for a world of trees with grubs hid in their bark to feed upon. The parts of our eye fit the laws of light to perfection, leading its rays to a sharp picture on our retina. Such mutual fitting of things diverse in origin argued design, it was held; and the designer was always treated as a man-loving deity.

The first step in these arguments was to prove that the design existed. Nature was ransacked for results obtained through separate things being co-adapted. Our eyes, for instance, originate in intra- uterine darkness, and the light originates in the sun, yet see how they fit each other. They are evidently made FOR each other. Vision is the end designed, light and eyes the separate means devised for its attainment.

It is strange, considering how unanimously our ancestors felt the force of this argument, to see how little it counts for since the triumph of the darwinian theory. Darwin opened our minds to the power of chance-happenings to bring forth 'fit' results if only they have time to add themselves together. He showed the enormous waste of nature in producing results that get destroyed because of their unfitness. He also emphasized the number of adaptations which, if designed, would argue an evil rather than a good designer. Here all depends upon the point of view. To the grub under the bark the exquisite fitness of the woodpecker's organism to extract him would certainly argue a diabolical designer.

Theologians have by this time stretched their minds so as to embrace the darwinian facts, and yet to interpret them as still showing divine purpose. It used to be a question of purpose AGAINST mechanism, of one OR the other. It was as if one should say "My shoes are evidently designed to fit my feet, hence it is impossible that they should have been produced by machinery." We know that they are both: they are made by a machinery itself designed to fit the feet with shoes. Theology need only stretch similarly the designs of God. As the aim of a football-team is not merely to get the ball to a certain goal (if that were so, they would simply get up on some dark night and place it there), but to get it there by a fixed MACHINERY OF CONDITIONS—the game's rules and the opposing players; so the aim of God is not merely, let us say, to make men and to save them, but rather to get this done through the sole agency of nature's vast machinery. Without nature's stupendous laws and counterforces, man's creation and perfection, we might suppose, would be too insipid achievements for God to have designed them.

This saves the form of the design-argument at the expense of its old easy human content. The designer is no longer the old man-like deity. His designs have grown so vast as to be incomprehensible to us humans. The WHAT of them so overwhelms us that to establish the mere THAT of a designer for them becomes of very little consequence in comparison. We can with difficulty comprehend the character of a cosmic mind whose purposes are fully revealed by the strange mixture of goods and evils that we find in this actual world's particulars. Or rather we cannot by any possibility comprehend it. The mere word 'design' by itself has, we see, no consequences and explains nothing. It is the barrenest of principles. The old question of WHETHER there is design is idle. The real question is WHAT is the world, whether or not it have a designer—and that can be revealed only by the study of all nature's particulars.

Remember that no matter what nature may have produced or may be producing, the means must necessarily have been adequate, must have been FITTED TO THAT PRODUCTION. The argument from fitness to design would consequently always apply, whatever were the product's character. The recent Mont-Pelee eruption, for example, required all previous history to produce that exact combination of ruined houses, human and animal corpses, sunken ships, volcanic ashes, etc., in just that one hideous configuration of positions. France had to be a nation and colonize Martinique. Our country had to exist and send our ships there. IF God aimed at just that result, the means by which the centuries bent their influences towards it, showed exquisite intelligence. And so of any state of things whatever, either in nature or in history, which we find actually realized. For the parts of things must always make SOME definite resultant, be it chaotic or harmonious. When we look at what has actually come, the conditions must always appear perfectly designed to ensure it. We can always say, therefore, in any conceivable world, of any conceivable character, that the whole cosmic machinery MAY have been designed to produce it.

Pragmatically, then, the abstract word 'design' is a blank cartridge. It carries no consequences, it does no execution. What sort of design? and what sort of a designer? are the only serious questions, and the study of facts is the only way of getting even approximate answers. Meanwhile, pending the slow answer from facts, anyone who insists that there is a designer and who is sure he is a divine one, gets a certain pragmatic benefit from the term—the same, in fact which we saw that the terms God, Spirit, or the Absolute, yield us 'Design,' worthless tho it be as a mere rationalistic principle set above or behind things for our admiration, becomes, if our faith concretes it into something theistic, a term of PROMISE. Returning with it into experience, we gain a more confiding outlook on the future. If not a blind force but a seeing force runs things, we may reasonably expect better issues. This vague confidence in the future is the sole pragmatic meaning at present discernible in the terms design and designer. But if cosmic confidence is right not wrong, better not worse, that is a most important meaning. That much at least of possible 'truth' the terms will then have in them.

I've put several parts in bold and one bit, which seems to me crucial, in bold blue. I find this argument compelling as far as the identity of the designer goes. James is right: design as such is empty until it starts talking about the designer, a discussion which (for reasons of cultural politics) ID has made itself unwilling to have.