Lewis and Aslan?

Maybe I have the CS Lewis books on the brain since I saw the Chronicles of Narnia this past weekend. It was really good, I thought; somewhat cheesy, but I knew the story going in. But it seems that perhaps the line of fact and fiction are a little blurred for some people. Take the new nickel, for example....Lewis and Clark or is it the Dawn Treader? (well, okay, minus the sea serpent).