I found this blog post on RichardDawkins.net, it makes for an excellent set of rebuttals to common questions on evolution for the times when you haven't got time to recite the whole of The Greatest Show on Earth:
Evolution is one of the best supported, most elegant, and most powerful theories in all of science. As it stands, it is the best explanation that we have for the diversity of life on Earth. Understanding evolution, as a scientifically literate society, is then a primary goal for anyone who was ever at least curious about the various forms of life we encounter. However, because evolutionary facts are thought to step on the toes of modern religious interpretations of life’s diversity (that all humans came from the interbreeding of a family generated from a rib bone, for example), there are many misconceptions that have been thrown in the way to act as obstacles to true understanding.