Ed Brayton, at Dispatches from the Culture Wars, links to a video from the Asylum Street Spankers titled "Stick Magnetic Ribbons on Your SUV" (to the tune, of course, of "Tie a Yellow Ribbon 'round the Old Oak Tree"). What got Ed started was all the bunkum on Barack Obama's decision not to wear an American flag pin on his lapel; the whole posting is worth reading.
Gerald E. Parsons, a folklorist with the Library of Congress's American Folklife Center, wrote a brief article on the origin of the yellow ribbon. Neat stuff. (There is a brief but updated bibliography at the end.)
On Educated & Poor, I saw this banner. It and more are available here.