CUNDY'S HARBOR, Maine On the big screen, the leader of the Dead Poets Society at an all-boys prep school was an inspirational teacher played by Robin Williams. In real life, it's a balding amateur poet who drives around in his "Poemobile," visiting and documenting the graves of dead poets and calling attention to their works. Walter Skold, founder of the Dead Poets Society of America, just finished a three-month road trip in which he visited the graves of 150 poets in 23 states. Skold boasts that he set a literary land speed record of 1.66 gpd (graves per day) over...