myHistro is a timeline builder and map creation tool rolled into one nice package. On myHistro you can build a personal timeline or build a timeline about a theme or event in history. Each event that you place on your timeline can be geolocated using Google Maps. myHistro timelines can be created online or you can use the free iPad app to create events on your timeline.
TimeGlider offers some nicer layout features compared to XTimeline, but is not quite as intuitive to use as XTimeline. The layout features that I like about TimeGlider is the ability to stagger or indent events below each other in a sequence. TimeGlider also makes it easy to display the relative importance of an event by increasing its size in comparison to other events on the timeline.
Time Toast is easy to learn to use. Time Toast does not have the more advanced editing options that XTimeline and TimeGlider offer.