Hi, All --
 
Regarding breastmilk vs. cow's milk ...  Yes, there IS a lot of information on the detailed differences.  The Lactation Biology course site at the University of Illinois (http://classes.aces.uiuc.edu/AnSci308/), for example, includes a milk composition comparison table which covers the basic composition of a great variety of milks.  (Extra credit:  Which animal's milk listed is closest in composition to human milk?)
 
The short answer (for protein allergy purposes) is that there is about an 85% overlap in the protein composition of milks across species.  The devil hides in the other 15%, which is why a baby may thrive on it's mother's milk but have a bad reaction to the milk of one (or usually most) other species.
 
There IS a great deal of science out there to support (or not) most of what's been said here recently.  (Although I still haven't found a source of the percentage of bedwetting that's allergic in origin, much less milk-allergic in origin.  I'm not saying the sources don't exist!  Just that I haven't seen any numbers yet, and I LIKE numbers :-) )
 
I hope this helps, rather than muddying the waters further,
--Beth Kevles
  Eating without Casein web site
  http://web.mit.edu/kevles/www/nomilk.html
  Disclaimer: Use this message at your own risk.  I am not a licensed practitioner of medicine.