Overview:

Gas is moved primarily by pipeline. The gas transport system is therefore mostly on land, with collection systems, continent crossing pipelines, and local distribution systems. Much of our gas comes from Texas, Louisiana and Canada. Storage, in tanks and underground in old gas wells, is an important part of the transport network. Liquefied natural gas (LNG) and liquid gas products such as propane are moved by ship, barge, truck, rail and pipeline.

Trade Associations:

Interstate Natural Gas Association of America.

Yahoo Sites:

Business and Economy: Companies: Energy: Petroleum: Natural Gas

Regulation:

The Federal Energy Regulatory Commission regulates interstate gas pipelines.
Natural Gas Import and Export Activities -- of the U.S. Department of Energy is responsible for regulating natural gas imports and exports.

Energy Information Administration (home page)

Trade periodicals:

American Gas Magazine covers gas transport and distribution to users.
PennWell has books, maps of gas pipelines, directories and databases.

Other sources:

Hydrocarbononline has archives, news and lots of links.
Naturalgas.com is sponsored mainly by Eastern gas distribution companies.

Sample firms:

ANR Pipeline Co. - company page also provides up to date operating, regulatory, tolls and tariff information.
Coastal Interstate Gas Co. - offers natural gas production, gathering and processing, transportation andstorage.
Iroquois Gas Transmission System - a 375-mile interstate natural gas pipeline owned by a partnership of 9 U.S. and Canadian energy companies.
Natural Gas Storage Corporation of North America is a significant player in the development of gas storage, power generation, and enhanced oil recovery.
NOVA Gas Transmission Ltd - North American natural gas transporter.
NrG Information Services, Inc. - developers of NrG Highway: a standardized software for transporting natural gas on multiple pipelines.
Pipeline Technologies, Inc. - engineering consulting company specializing in natural gas mainline transmission facilities and pipelines.
Texas Eastern Transmission Corp - operates a 10,000-mile pipeline system with peak-day capacity in excess of 5.7 Bcf connecting Gulf Coast supply with markets in the Central, Mid-Atlantic and New England states.
The Williams Companies - interstate natural gas pipelines that move more natural gas everyday than any other pipeline system in the nation.Williams was the first energy company to pioneer entry into the communications industry, a frenzied trend for utilities and pipelines today.
TransCanada PipeLines - transmits, markets and processes energy in North America, and around the world. Its pipeline system transports natural gas and crude oil. NOVA is a subsidiary of Transcanada.