Palladium

Visual Elements: Palladium - Image, source, uses, physical information, and ionisation energies.
http://www.chemsoc.org/viselements/pages/palladium.html

It's Elemental: Palladium - Basic physical and historical information.
http://education.jlab.org/itselemental/ele046.html

WebElements: Palladium - Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/webelements/elements/text/Pd/key.html

ChemicalElements.com: Palladium - Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/pd.html

ChemGlobe: Palladium - Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/46.html

Stillwater Palladium - All aspects of palladium with its extensive history, production, and uses.
http://www.stillwaterpalladium.com/

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

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

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

LANL: Palladium - History, sources, properties, and uses.
http://periodic.lanl.gov/elements/46.html