I think panda thumbs and the human urethra are examples that run contrary to the concept of intelligent design. IMO the creationist 'arguement' is simply a series of over-simplificiations or sheer untruths intended to attack existing evidence and conclusions, rather than to actually derive some factual scientific conclusion.
That's why I tend to get pissed off at it; it's an attempt to destroy something they don't like rather than actually examine it and see what the proveable / evidence-able alternatives are.
This, incidentally, I find very disturbing;
[q]
It would not be far-fetched, said William S. Harris, a Kansas City researcher who favors intelligent design, to conclude that DNA itself is the work of an intelligent being. Students, he said, should be told that.[/q]
That's not science (there's simply no evidence, no way proving it); that's religion, and should be taught in religious education. That's what RE is for, after all.