Interesting about the passports and Mexico. When we went to Mexico over New Years, we only had to have photo ID because we were there less than 7 days. Anything over that required a passport, however the link Mozie put up says ALL travel will require it. Hmmmm...
We've been near a border town all winter. Walking across the bridge and back for the day has required only a photo ID to get back into the good old USA. (Gotta wonder if that's going to change). Nothing except a quarter or two for the turnstiles is required to get into Mexico.
Coming back into America, an agent asks if you are a US citizen, you (or anybody going through the line, Hispanics included) answers "yes", the agent barely glances at your drivers license and you sail on through.
December 31, 2006 – Passport or other accepted document required for all air and sea travel to or from Mexico and Canada.
December 31, 2007 – Passport or other accepted document required for all air, sea and land border crossings.
Looks like as of 12/31/07 ALL border crossings to or from Mexico and Canada will require a passport........
That happened to us too, when we went to Pieadras Negres, I was so surprised, I asked the guard if he liked my picture. It ticked me off.