Aluminum

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

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

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

WebElements: Aluminum - Extensive information on history, uses, occurrence, compounds, and properties of the element.
http://www.webelements.com/webelements/elements/text/Al/key.html

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

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

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

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

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

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

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