Iridium From Concept to Reality
Technical article by Robert Nelson describing the Iridium satellite communication system.
http://www.aticourses.com/news/iridium.htm

LANL: Iridium
History, properties, uses, and sources.
http://periodic.lanl.gov/elements/77.html

Iridium Flares
Observing Iridium flashes - a spectacular new phenomena in the sky
http://www.assa.org.au/observing/iridium/

It's Elemental: Iridium
The Element Iridium - Basic Physical and Historical Information
http://education.jlab.org/itselemental/ele077.html

ChemicalElements.com: Iridium
Basic information, atomic structure, and table of isotopes.
http://www.chemicalelements.com/elements/ir.html

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

ChemGlobe: Iridium
The chemical element [Ir] - Iridium - Datasheet
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/77.html

Whenever Communications, Inc.
Satellite phone rentals satellite phone sales and satellite phone service at Satellite Phone Store. Your source for Iridium, Globalstar, Inmarsat and Thuraya sat phones, rent satellite phones, satellite mobile phones and marine satellite phones
http://www.satellitephonestore.com/

EnvironmentalChemistry.com: Iridium
Comprehensive information for the element Iridium – Ir is provided by this page including scores of properties, element names in many languages, most known nuclides and technical terms are linked to their definitions.
http://environmentalchemistry.com/yogi/periodic/Ir.html

Lenntech: Iridium
chemical properties, health and environmental effects of iridium
http://www.lenntech.com/Periodic-chart-elements/Ir-en.htm