ORIGINAL: Nord QC Bouman
The NA land crossings are to be in affect by Jan 2007. Air and Sea crossings are to be in affect by Jan 2006, or currently. My advice is to get one now because as 2007 approaches, issuing these will have a back log.
Actually, It will be Dec 31,2007 for all land crossings. But it looks like there will be changes to make it easier and not require a passport.