ChemGlobe: Zinc: Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Zinc: Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Zinc: Atomic structure, chemical and physical properties, and table of nuclides.
General Information of Zinc: Contains basic information of history, sources, production, uses, health, and effects of Zinc deficiency.
It's Elemental: Zinc: Basic physical and historical information.
LANL: Zinc: History, sources, properties, and uses.
Lenntech: Zinc: Physical data, chemical properties, health and environmental effects.
USGS Minerals Information: Zinc: Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Visual Elements: Zinc: Image, animation, physical information, and key isotopes.
WebElements: Zinc: Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Zinc: Properties of the element, including its history, applications, and characteristics.
Zinc: Data tables and historic information.