I admit failure on this front today, but with good reason. I've been debating the validity of evolution online intensely over the past week, and am surprised that the level of understanding of the theory amongst the general public is so low. Furthermore, there are creationists who have flagrant misconceptions about the theory.
While I've been involved in my own discussions, biologist blogger PZ Myers (along with 300+ students, scientists, and secularists) has recently been to a trip to Ken Ham's odious creation "museum", a place where ignorance is not only embraced but flaunted.
With these two items in mind, I found it appropriate to designate Talk Origins(.org) as today's GIM appointee. This is a site dedicated to presenting the evidence, clarifying misconceptions, and harboring open discussion on evolution. It is a great place to visit for information on the most important theory in biology. Some people really need to see the section on evidence...
Seriously, Wendy... the evidence section... read it. All of it.