I always print it out and bring it with me. It's easier to hand it to someone to read than to have to recite all the info if needed.
I print out all my online arrangements, hotels, cars, airlines to bring with me.
2008 Liberty OTS (Caribbean)
2007 Summit (Alaska)
2006 Century, Infinity (Panama Canal), Summit (Hawaii)
2005 Millenium, Voyager of the Seas, Jewel of the Seas B2B
2004 Explorer of the Seas, Constellation (Canada/New England)
2003 Horizon (Bermuda), Summit
2002 Explorer of the Seas, Brilliance of the Seas (Caribbean)