Phone books:

Superpages.com - yellow pages; white pages; map directions; reverse phone book; (Verizon).
Telephone directories on the Web - phone books; yellow pages; white pages.
AnyWho - Internet Directory Assistance, (AT&T).

General search engines

AltaVista
All the web
All4one
Ask
Clusty – relatively new.

Google!

catalogs.google.com - product catalogs only.

Info.com

MetaCrawler
Open Directory Project
Overture
Starting Point
Webcrawler
Yahoo!

General reference information

Answers.com
Intute – “Web resources for education and research”
Wikipedia, the free encyclopedia

Specialized search sites

Energysearch - EPRI search engine.
InfoMedical.com - "The Medical Business search engine".
Math search - 180,000 math documents.
Medical World Search
NDTnet - Virtual NDT Library database.
PRSearch - page rank and Google position search.
Google scholar - literature. (beta)
Scirus - scientific only, (web plus journal articles).
Lookupstream - joint search of the technical libraries of Am.Assn.Petroleum Geologists, Soc. Exploration Geophysicists and Soc Petroleum Engineers.

Product directories

GlobalSpec.com  - an extensive product directory - engineering and articles.
Industrial Process Measurement, Inc
Flow Control Network - flow sensors, instrumentation and control components.
ISC US buyer's guide - manufacturers and products - provided by International Scientific Communications, Inc.
ASNT Buyer's Guide - American Society of Nondestructive Testing.
ThomasNet  - formerly Thomas Register. Extensive.
Metrology World.com - buyer's guide for products and services for weight and measurements.
Food Online
TestMart - electronic test and measurement products, includes manufacturers data and a library of application notes.
RF Globalnet -- RF/microwave and wireless industry.  (an extensive well-maintained site.)
Softsearch - a directory of commercial and industrial software products. <LS>
Analytical and Measurement Equipment related to semiconductor processing - Nanox .
OPTICS.ORG Buyer's Guide
Fiber Optics Online Buyers Guide   - products for the telecommunications industry.
TechExpo Buyers Guide extensive, for example, also includes a directory of technical magazines / trade journals.   
Pneumatic-Source.com - a directory of pneumatic manufacturers. <LS>  
The BestTest Directory of Test, Measurement and Instrumentation Products
The Network Buyer's Guide - provides information on the computer storage and networking industry.
Water and Wasterwater Dot Com

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