This site has so many links, for so many different topics, it is difficult to put together a summary of what you might find. My thought... click and take a peek for yourself!
This is a really great site for organizing flash card activities. You can do so with particular books, access other instructors files, and create quizzes to correspond with your current class. A very nice site to use for FREE ;-)
Here is a helpful site for working with history, chemistry, or specific writing situations where the frame of reference is time specific. Time lines for all types of events throughout history. Popular Timelines - Timelines.com
An educator's list (LARGE LIST) of websites that pertain to assessment, instruction, tools, design, forums, and a plethora of other types of information that will make class work much easier to tackle.