Susan,
Thanks for mentioning Wallerstein's book.  Another wonderful resource is "Say
No to Circumcision!" by Thomas J. Ritter, MD; Hourglass Books, PO Box 171,
Aptos, CA 95001.  Dr. Ritter is a surgeon.  This book contains the best
discussion I have found about the natural functions of the foreskin.  I
learned more from Dr. Ritter than in medical school anatomy classes.  The only
problem I have found with this book is that the emphatic title keeps people
who are already leaning toward circumcision from reading it.
Catherine Watson Genna, IBCLC