Events In Science, Mathematics, and Technology - Large collection of timelines pinpoint major events, discoveries, and peoples. Topics range from medicine to transportation to astronomy. - http://www2.gsu.edu/~mstnrhx/9870/science.htm
America's Timeline - Select a century or decade to generate a timeline. - http://www.historychannel.com/timeline/
Timeline of Art History - Provides an overview of the history of art as illustrated and represented in the collection of the Metropolitan Museum of Art. - http://www.metmuseum.org/toah/splash.htm
Food Timeline - Learn about the diets of prehistoric people, what the Vikings ate as they set off to explore the world, and how Thomas Jefferson made his ice cream. - http://www.foodtimeline.org/
Computer History Museum: A History of the Internet - Traces the phenomena from 1962 (before the term "Internet" was even coined) to the modern era. - http://www.computerhistory.org/exhibits/internet_history/
LIFE Online: Millennium - Time and Life magazines identify the top 100 events of the past 1,000 years. - http://www.life.com/Life/millennium/events/100.html
Strange Science: Timeline - Timeline of important events in paleontology and biology. - http://www.strangescience.net/timeline.htm
Science Timeline - A chronology from the 7th millenium BC to the present day, with brief explanations of events in the history of Western natural philosophy and sciences. - http://www.sciencetimeline.net/
World History - A timeline of history from the formation of the Earth to the present. From Infoplease. - http://www.infoplease.com/ipa/A0001196.html