Features daily updates to crude oil prices, current listings of oil and gas properties and prospects for sale, and discussion groups.
http://www.discoveryplace.com/

Hart's E and P
http://www.eandpnet.com/hart%27s

Devoted to oil and gas resources.
http://www.energyconnect.com/
http://www.energypress.com/
http://www.offhore-technology.com/
http://oiljob.com/

Information on manufacturing, technology, exploration, equipment, and supplies. Offers a discussion forum, chat, a newsletter and software.
http://www.oilandgasonline.com/
http://oildirectory.com/
http://www.oilfielddirectory.com/

Online service for oil & gas industry, provides industry news, and marketing info, stocks and oil prices, job and product listings, and classified ads.
http://www.oilonline.com/

Llinks to oil companies, job agencies, and other industry-related organizations.
http://www.oilsurvey.com/

Resources and community for the oil and gas industry.
http://oilink.com/

Web directory for the oil and gas industries: exploration, engineering, production, and offshore construction.
http://www.oil.com/
http://www.petro21.com/

Global database of technical and commercial resources for the petroleum, petrochemical, refining, and pipeline industries
http://www.petrointernational.com/
http://petroleumworld.com/

Offers technical and commercial information.
http://petroassist.com/

Online portal serving the petroleum equipment retail industry. Includes news, classified ads, and industry publications.
http://www.ptrolplaza.com/

Features business listings, careers, financial information, and a search engine.
http://www.petroleumplace.com/

Free reference source to companies in the oil, gas, pigging, wastewater and associated pipeline industries world-wide.
http://www.pipedir.com/
Journals, trade shows, links.
http://www.undergroundinfo.com/
http://worldoil.com/

Association of Energy Service Companies. AESC is the national trade association representing energy service companies and providing legislative, educational, technical and safety information and support to 600 member companies.
http://www.aesc.net/

Petrolatin
http://www.petrolatin.com/
http://www.noticias-petroleo.com/