Iodine

It's Elemental: Iodine - Basic physical and historical information.
http://education.jlab.org/itselemental/ele053.html

LANL: Iodine - History, sources, uses, properties, and isotopes.
http://periodic.lanl.gov/elements/53.html

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

Radiochemistry of Iodine - Full text of the monograph by Jacob Kleinberg (University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico and University of Kansas, Lawrence, Kansas). [PDF] <small>(September, 1977)</small>
http://library.lanl.gov/cgi-bin/getfile?rc000043.pdf

ChemicalElements.com: Iodine - Basic information, atomic structure, and table of isotopes.
http://www.chemicalelements.com/elements/i.html

ChemGlobe: Iodine - Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/53.html

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

WebElements: Iodine - Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/iodine/

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

Visual Elements: Iodine - General and physical information, source, uses, biological role, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/iodine.html

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