Galileo: Letter to the Grand Duchess Christina
Galileo's great defense of the independence of science from religious authority.
http://www.fordham.edu/halsall/mod/galileo-tuscany.html

Galileo and Einstein
A lecture course by Michael Fowler of the University of Virginia: History of Astronomy from ancient Greece to Relativity.
http://www.phys.virginia.edu/classes/109N/home.html

Galileo Galilei
Biography, with links to related internet sites.
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Galileo.html

Galileo and Einstein
A resource for a University of Virginia physics course, with lecture notes.
http://galileoandeinstein.physics.virginia.edu/

Trial of Galileo Galilei
A collection of primary documents, essays, ancient texts, maps, photos, paintings and other materials relating to the trial in 1633.
http://www.law.umkc.edu/faculty/projects/ftrials/galileo/galileo.html

The Life and Work of Galileo (1564-1642)
A detailed account of Galileo's early influences and summary of important events in his efforts to prove heliocentricity.
http://www.skyscript.co.uk/galileo.html

Galileo Galilei's Notes on Motion
pertaining to the theorems on motion published in the Discorsi.
http://www.mpiwg-berlin.mpg.de/Galileo_Prototype/

BBC Online: Galileo
In-depth look at Galileo's life and his significance.
http://www.bbc.co.uk/history/historic_figures/galilei_galileo.shtml

The Galileo Project
Comprehensive and detailed information on the life and work of Galileo Galilei (1564-1642) from Rice University.
http://galileo.rice.edu/

Galileo Galilei - Astronomy Rebel With a Cause
Concise biography.
http://space.about.com/cs/astronomerbios/a/galileobio.htm

Galileo Galilei (1564-1642)
Features information about college education, studies about bodies in motion, and becoming famous. Describes the impact of the scientist's invention of the telescope on ancient cosmological beliefs. Includes bibliography.
http://www.hao.ucar.edu/public/education/sp/images/galileo.html