Signs point to "neigh."
Okay, that was terrible.
Aaaanyway, here's a link to article on the problems with the Horse Series, courtesy of Steve:
Here is a detailed rebuttal that I have not yet read:
Feel free to post your own thoughts in the comments.
My two cents: I think the "just so" story nature of some explanations of how certain traits or species evolved lead people to reject the theory of evolution itself when they find something wrong with the particular explanation. Part of Dr. Morris' argument seems to be that the scientists got it wrong in the textbooks so they must have it wrong in their minds. This may be a failure of popular science or science education that they give people enough information to think they know what they're talking about but not enough that they actually know what they're talking about. I'm totally guilty of this myself--I have no idea how fossils are dated or what experiments have produced the evolution of species, but I still feel like I can talk about the evidence for evolution to an ID supporter.