From the University of Pennsylvania Museum of Archaeology and Anthropology, this site combines images of artifacts with articles written by historians and scholars. Note the "Extra Topics" drop down folder.
The Internet Encyclopedia of Philosophy is a peer-reviewed, scholarly site.
From the Stanford Encyclopedia of Philosophy, use the "Entry Contents" on the left. This site contains information on general Greek life, as well as an excellent biography of the man himself.
Historical debate veers between admiring and denigrating Alexander the Great, but Professor Paul Cartledge puts him in his proper historical context. This is an article published on the BBC website. It includes a timeline, external links, and a bibliography.
The very excellent British Museum web site.