Gold

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

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

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

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

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

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

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

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/

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

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

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

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

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