The US State Department now issues a Passport Card as well as the Passport Book, which every one is familiar. Here are some interesting comments about it from the U.S. Department of State web site: "We began production of the U.S. Passport Card on July 14, 2008. As of March 2010, more than 2,700,000 Passport Cards have been issued to U.S. citizens." "The passport card is the wallet-size travel document that can only be used to re-enter the United States at land border-crossings and sea ports-of-entry from Canada, Mexico, the Caribbean, and Bermuda. The card provides a less expensive, smaller,...