Four Wing Boomerang - Plans for building and flying a four-wing boomerang from a manilla file folder. - http://www.reachoutmichigan.org/funexperiments/agesubject/lessons/other/Four_Wing_Boomerang.html
MrDunston Boomerangs - Crafting and throwing instructions, plans, photos and links. - http://www.mrdunston.com/boomerang
Cardboard Boomerang - Explains how to design and make a cardboard boomerang, with pictures and videos. - http://www.science.edu.sg/ssc/detailed.jsp?artid=3794&type=4&root=205&parent=205&cat=237
Finger Boomerangs - Plans for making and flying small boomerangs made from file card paper. - http://www.grc.nasa.gov/WWW/K-12/TRC/Aeronautics/FINGER_BOOMERANGS.html
Whishhbone Boomerangs - Instructions for making your own. Includes materials, shapes, pattern, airfoils, carving, and tuning discussions. - http://whishhbone.freeyellow.com/construction.html
Pat's Boom Bag - Devoted to the construction of boomerangs; includes instructions for multiple lap joint sticks and general tips. - http://www.tyler.net/psteigman/