Ken Burns’ documentary on Jefferson, available in several parts on YouTube.
Founding Father, Third President, Author of the Declaration of Independence, Renaissance Man: the animating spirit and living embodiment of a new country and a new age bestowing freedom upon millions, not just the privileged few.
Biography, documents, quotations, entries from the TJ Encyclopedia, a gallery of portraits, a day in the life, all at Monticello.org.
Beautifully detailed, illustrated time line at Library of Congress website.
The Thomas Jefferson Papers, roughly 27,000 documents, at the Library of Congress website.
Beautiful Jefferson exhibits at Library of Congress website.
Encyclopedic entry at Conservapedia.com.