NOTE: Many of these images are not in the public domain. If you want to use an image, make sure that you have permission to use it (look on each individual website for more information).
Children’s Books with Positive Images of Breastfeeding (or see the long version) You can get many of them here.
Victorian Era Breastfeeding Daguerrotypes
Free food & health clip art (including breastfeeding clip art) from foodandhealth.com
The Art of Breastfeeding by Susan Wadsworth
US Agricultural Research Service Image Gallery
Library of Congress Prints & Photographs
Commercial websites
INFACT Canada Breastfeeding Posters
NursingBabies.com is the website of a photographer who specializes in pregnancy and nursing photos
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Attachments Catalog. This catalog has beautiful breastfeeding prints, photos, and notecards for sale (among other things). Lori Thompson’s photographs are beautiful.
Clinical photos and more for lactation professionals
The Breastfeeding Atlas as an Ebook
WICWorks Breastfeeding Educational Materials
The 
Professional Breastfeeding Bookstore also has many books with clinical photos, including The Breastfeeding Atlas (3rd edition includes a DVD, with CD-ROM available separately), Clinical Lactation: A Visual Guide, Breastfeeding and Human Lactation (includes a CD-ROM), and Comprehensive Lactation Consultant Exam Review.