Gold

It's Elemental: Gold - Basic physical and historical information.
http://education.jlab.org/itselemental/ele079.html

Visual Elements: Gold - Image, general and physical information, source, uses, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/gold.html

ChemicalElements.com: Gold - Basic information, atomic structure, and table of isotopes.
http://www.chemicalelements.com/elements/au.html

Wikipedia: Gold - Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Gold

Lenntech: Gold - Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Au-en.htm

EnvironmentalChemistry.com: Gold - Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Au.html

World Gold Council: Science and Industry - Information about various different topics regarding gold.
http://www.gold.org/discover/sci_indu/

WebElements: Gold - Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/gold/

USGS Minerals Information: Gold - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
http://minerals.usgs.gov/minerals/pubs/commodity/gold/

Radiochemistry of Gold - Full text of the monograph by J. F. Emery (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] <small>(May, 1961)</small>
http://library.lanl.gov/cgi-bin/getfile?rc000062.pdf

Gold Bulletin - The peer reviewed journal on the latest science, technology and applications of gold. It includes papers on the latest research advances, reviews, conference reports, and highlights of patents and scientific literature.
http://www.goldbulletin.org

LANL: Gold - Sources, properties, uses, cost, and isotopes.
http://periodic.lanl.gov/elements/79.html

ChemGlobe: Gold - Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/79.html