For this list, I select general timelines and chronologies, as opposed to ones devoted to a single person's life:
- For medieval Europe and anything earlier, try the excellent chronologies on Exploring Ancient World Cultures from the University of Evansville.
- Tom Dale Keever at Columbia has put together an Early Modern Chronology on one huge page, which makes it great for searching.
- Though he calls it "experimental," Jack Lynch's Eighteenth-Century Chronology is the proverbial cat's meow for the years 1660 to 1800.
- The interface of The Romantic Chronology could be more intuitive, but it rewards the work of navigating the site.
- The Victorian Web's timeline has the advantage of covering 1709 to 1918 and the disadvantage of not saying very much. Jim Skipper's timeline has a wider variety of information.
- John Eckman's Modernism Timeline covers 1865 to 1950. It has an interesting search interface that will allow the developing site a lot of room for growth.
- Thanks to the millenium, chronologies of twentieth-century events became a popular business. See, for example, the Family Education Network's Year by Year page, which also has a number of timelines by subject. Also, About.com has put together a list of twentieth-century timelines.