I don't know about all of you, but I am always traveling for business. A friend of mine just sent me an email reminding me about the changes to the travel documentation requirements that are going into effect at the beginning of the year.
Here are the basics and then I'll give you a link to where I found this information...
"Beginning January 23, 2007, ALL persons, including U.S. citizens, traveling by air between the United States and Canada, Mexico, Central and South America, the Caribbean, and Bermuda will be required to present a valid passport, Air NEXUS card, or U.S. Coast Guard Merchant Mariner Document, or an Alien Registration Card, Form I-551, if applicable."
Check out the full requirements HERE