I am certain of ID and it has been well defended by Michael Behe.
Random evolution works well up to the species level, perhaps to the genus and family level too. But at the level of vertebrate classes (birds, fish, etc), the molecular developmental programs needed would be beyond the edge of evolution. Darwinian evolution works well when a single small change in an organisms DNA produces a notable effect. Thats what happens to give the various breeds of dogs. But when multiple, coordinated changes are needed for an effect, chance mutation loses its power.
I like this one: If you and a friend walked by Mount Rushmore, even if you had never heard of it before, you would immediately realize that the faces on the mountain were designed. Not for a moment would you think they were the result of random forces such as wind and erosion. Your conclusion of design would be certain, because you would see how well the pieces of the mountain fit the purpose of portraying an image.
Whenever we perceive a purposeful arrangement of parts we suspect design. The more parts there are, and the more clearly they fit the purpose, the more confident our conclusion of design becomes. In the past fifty years science has discovered a very purposeful arrangement of parts in the cells molecular machinery. That is the evidence for the involvement of a designer in life on earth.
http://calitreview.com/260