Time Lines Made Easy by Google
Certainly there are several other time lines devices out there, but google.com has just started this one where you can type something like "American Revolution" and it instantly comes up with one and then there are links to the apprpriate subjects. It can also divide it even further so you could just see the year 1775 for example. When you get to this site, click on any of the predone example. When you get there, erase the choice and put in yours and press return. After this click on "timeline."