This is a series of papers from a recent Sackler colloquium of the National Academy of Sciences entitled “In the Light of Evolution III: Two Centuries of Darwin“. You can watch most of the presentations online here. The conference papers are published in a supplemental issue of the PNAS.
I read Daniel Dennett‘s paper because of my personal interest. He is a philosopher in science. In his paper, he provides a simple overview on why it is not necessary to have an intelligent designer to make complicated biological machines.
Reference
Dennett D. Darwin’s “strange inversion of reasoning”. Proc Natl Acad Sci U S A. 2009 Jun 15. [PubMed][pdf]