(see other pathfinder for specific 1950s sites)
Year By Year 1900-2010 from Infoplease (watch out for popup ads)
dMarie time Capsule Find out how much food cost, what movies were popular and other pop culture of the century on this site
This Day In History The History Channel. Look up what happened on any particular day, but also use the search box on this site to search for specific historical events.
Decade by Decade: about.com
American Women Through Time A resource that provides timelines by decade