I wear dog tags with name, emergency contact info, blood type, drug allergies (NKDA - no known drug allergies).
I have friends who also keep info in bike pouch and I just don't think that's enough - I know a fellow who was riding out in rural PA, and woke up in hospital - he had hit something in the road and gone end-o into poision ivy, several yards from the bike. I suppose it could be possible to be in a situtation in which the bike was not with you (over an embankment?)
I encourage you all to have something on your body - RoadID tags are great, dog tags or other (tats - clever idea!). It would be possible to be separated from the bike and the info would be lost....
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I just love turning the round legs of my Iron Horse!