That is beside the point... you asked how a claw could evolve into a hoof. That was the question I was addressing. However, if you saw a
Hyracotherium munching on some leaves, I doubt that you would say, "Hey its a horse!"
http://farm1.static.flickr.com/74/166719017_bea3d69f8d.jpg
It seems we've jumped to the conclusion that a hand turns into a flipper, or vice versa without a discernible reason for such a conclusion. However, the facts are simply that as a hand is supported by bones in its way, a flipper and a wing are supported by bones each their own way. It's no mystery that each creature's phalanges work in segments, how else would the muscles over the structure have flexibility?
The point I was making is that they all (hand, flipper, wing,etc.) have the same basic structure. The same bones, in the same order. My other point is that penguins use a wing (with feathers) as a flipper. Why? This is the type of adaption that evolution can explain, without resorting to "God likes variety."
Is this where I link answersingenesis? I might read that book though (I have a long list.)
It's a very good book, and not very long. I strongly recommend it.
As far as AIG, let me tell you what surprised me the most about creationists I have encountered. The fact that they will (in general) accept any source without question, as long as it supports their position. It doesn't matter how dishonest or if the site is filled with misinformation or outright lies. AIG is one of these sites...yet it is also one of the most popular. Would you continue to use it as a source of information, if I showed you how dishonest it is?
Anyway, I would expect similar traits to be produced among non relatives of species utilizing the same method of building these traits - DNA. Whatever adaptation the environment requires, there's a genetic combination to achieve the necessary traits.
But this isn't what we see. We do not see a world of cut and paste organisms, with similar traits shared across all of them. We only see similar traits in
related species. We do not see whales with feathers, or fish with a placenta. We do not see insect-like eyes in mammals, or insect wings on sugar gliders. We do not see chimeras, hippogriffs, hydras (non microscopic kinds!), satyrs, centaurs, etc.
Also, the fact that all organsims share DNA as the molecule of heredity, does not explain the sequence pattern we find among different species... the type of sequences similarities we find in human family trees... a nested hierarchy.