Originally Posted by
ESpen36
Sorry to contradict, but you definitely can use a normal passport book at land/sea crossings from Canada/Mexico! A passport book is certainly a WHTI-compliant document!
More info here:
http://www.getyouhome.gov/html/eng_map.html
I believe what the OP meant was that using your passport at those crossings will not get you any trusted traveler benefits. Only the card will give you the NEXUS/SENTRI benefits.