PZ Myers at Pharyngula has taken on the Delk human/dinosaur footprint. Here is what he has to say:
Unfortunately, they both look ridiculously fake. The human print has toes like tubes and a wierdly dug-in big toe, and looks ridiculously fake. The dino print is even worse — it's basically a three-pronged flat plate, looking like it was modeled after the smooth bottoms of a plastic dinosaur toy.
That's about it. He does include a picture of an honest-to-goodness three-toed dinosaur track, but he plainly doesn't take the Delk print seriously. Until it is examined in detail, we probably won't know how it was created.