ChemGlobe: Lead
   Electronic, thermal, and steric data along with an isotope table.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/82.html

ChemicalElements.com: Lead
   Basic information, atomic structure, and isotopes table.
   http://www.chemicalelements.com/elements/pb.html

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

It's Elemental: Lead
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele082.html

LANL: Lead
   Properties, forms, uses, and handling.
   http://periodic.lanl.gov/elements/82.html

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

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

Visual Elements: Lead
   Image, uses, physical information, and key isotopes.
   http://www.chemsoc.org/viselements/pages/lead.html

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