Professional organizations:

National Tank Truck Carriers (NTTC)

American Trucking Association (ATA)

Charleston Metro Chamber of Commerce

Helpful industry-related links:

Bulk Transporter (formerly Modern Bulk)

Bulk Transporter's tank cleaning directory

Transport Topics

Google Maps

Mapquest

National Weather Service

Industry-related government sites:

US Government's Official Web Portal

Department of Transportation (DOT)

Pipeline & Hazardous Materials Safety Administration (PHMSA)

Bureau of Transportation Statistics

Environmental Protection Agency

Federal Motor Carrier Safety Administration

Federal Railroad Administration (FRA)

Government Printing Office (GPO)

National Highway Traffic Safety Administration

Surface Transportation Board

Transportation Research Board

US Customs and Border Protection

Federal Trade Commission (FTC)

House Transportation and Infrastructure Committee

US Senate Committee on Commerce, Science and Transportation

Federal Emergency Management Agency (FEMA)

Charities:

American Red Cross

Humanities Foundation

Leukemia & Lymphoma Society

Lowcountry AIDS Service

The Miami Project/The Buoniconti Fund to Cure Paralysis

Just for fun:

Snopes (Urban legend site to research those outlandish forwarded emails we all get!)