Aluminium versus Aluminum
   The different American spelling of what British English spells 'aluminium' sometimes cause puzzlement as to how it could have come about. This article tells that story.
   http://www.quinion.com/words/articles/aluminium.htm

Aluminum - Linked to Many Diseases in Humans
   Provides many references on Aluminum's effect on humans and the environment.
   http://www.luminet.net/~wenonah/hydro/al.htm

ChemGlobe: Aluminium
   Electronic, thermal, and steric data along with basic information.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/13.html

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

It's Elemental: Aluminum
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele013.html

LANL: Aluminum
   History, sources, uses, and compounds.
   http://periodic.lanl.gov/elements/13.html

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

USGS Minerals Information: Aluminum
   Overview and a number of publications in PDF format.
   http://minerals.usgs.gov/minerals/pubs/commodity/aluminum/

Visual Elements: Aluminium
   Image, animation, source, uses, key isotopes, and covalent bonds.
   http://www.chemsoc.org/viselements/pages/aluminium.html

Wikipedia: Aluminum
   Details the properties of the element, including its history, applications, and characteristics.
   http://en.wikipedia.org/wiki/Aluminum