SHABBAT

Visit the following links for a good overview of this topic.

http://www.ou.org/chagim/shabbat/

http://www.ou.org/publications/kaplan/shabbat/default.htm

http://www.everythingjewish.com/Shabbat/Shabbat_Origins.htm

http://www.us-israel.org/jsource/Judaism/shabbat.html

http://www.jewfaq.org/shabbat.htm