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ChemGlobe: Thorium - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Thorium - Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Thorium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Thorium - Basic physical and historical information.
LANL: Thorium - Uses, properties, production, properties.
Lenntech: Thorium - Physical data, chemical properties, health and environmental effects.
Thorium - Information about uses, what is thorium, sources, coutries reserves of thorium.
Thorium - An information source of thorium and thorium-related topics.
USGS Minerals Information: Thorium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Visual Elements: Thorium - Image, general and physical information, and key isotopes.
Wikipedia: Thorium - Properties of the element, including its history, applications, and characteristics.