Golomb Rulers
Table of lengths of shortest known Golomb rulers, counts of optimal and near-optimal rulers, and some Fortran programs for dealing with Golomb rulers.
http://researchweb.watson.ibm.com/people/s/shearer/grule.html

Mathematical Association of America - Math Games: Rulers, Arrays, and Gracefulness
Ed Pegg Jr. writes about the history (and future) of Golomb rulers and related concepts.
http://www.maa.org/editorial/mathgames/mathgames_11_15_04.html

Donwei Machinery Industry Co., Ltd.
donwei,scissors,sewing,bobbin,craft,quilting,ruler,knittingneedle,crochethook,cuttingmat,Sewing Needle
http://www.donwei.com.tw/

Golomb Rulers - The Search For 20, 21 and 22!
The Social Media blog is your single destination for updates on the AIM Buddy blog, the AIM Pages blog, the AOL Community Info blog, the Expressions Factory, the Marvelous Mob and the Social Media Mess blog.
http://members.aol.com/golomb20/

Modular and Regular Golomb Rulers
Detailed, theoretical tutorial with references.
http://cgm.cs.mcgill.ca/~athens/cs507/Projects/2003/JustinColannino/

Vola
Dal 1946, VOLA è produttore di strumenti di misura.
http://www.vola-instruments.com/

Chiao King Industrial Co., Ltd.
Manufacturers Directory offers suppliers/exporters/wholesalers/manufacturers & products made in China, Taiwan, Hong Kong & Asia, Products Directory & Trade Leads helps the global buyers & suppliers sourcing Taiwan/China/Asia leading Suppliers,Products,Exporters,Manufacturers,Sources & business opportunity.
http://www.stapler.ttnet.net

Think Quest - Aztecs
Aztec rulers, their religious beliefs, the Aztec gods, Aztec life, Aztec technology, Aztec culture, and the Spanish Conquest are the topics of this site.
http://library.thinkquest.org/27981/

Executive Line
Advertising specialties and promotional products by Executive Line, advertising specialties, promotional products, advertising products, promotional give a ways, ad specialties, metal rulers, plastic rulers, metal business card, metal gauges, custom rulers, and etched rulers.
http://www.executiveline.com/

distributed.net
A distributed computing project currently trying to take the RSA challenge of RC5-64, and also working on OGR-24 and 25 (Optimal Golomb Rulers). Previous projects included CSC and DES.
http://www.distributed.net/