A very meta service. Cabinet magazine, a hip paper-based journal of unusual ideas, published a chronology of calendars and timelines in history a few years ago. They updated the list for the web. It's quite comprehensive, and provides in one chronological sequence the major inventions in the art of chronologies. But it could be made more complete and cooly recursive by adding at the end of their timeline, their own creation as the "first timeline of timelines."
1753 Jacques Barbeu-Duborg, the French translator and disciple of Benjamin Franklin, creates his Carte chronologique, a 54-foot timeline of history from Creation contained in an iron case.