Marxism is both a political and economic philosophy, and the two are intertwined. Marxism consists of the idea that human actions and institution are determined by economics and that class struggle is needed in order to create change. It also posits that capitalism will eventually be taken over by communism.
Regular Websites
The Communist Party USA is the multiracial, multinationa party uniting men and women of the working class. - Communist Party - USA
http://www.cpusa.org/
Marx's 'Das Kapital' Lives On in Capitalist Age
National Public Radio presentation of Karl Marx consists of biographical material, excerpts from Das Kapital, and information about Marxism both written and in video. - Marx's 'Das Kapital' Lives On in Capitalist Age
http://www.npr.org/templates/story/story.php?storyId=16697381
Originally created for students who wanted to understand the basics of marxism, this site breaks down items such as the state power, religion, class, and gender as they relate to marxism. - Marxism Made Simple
http://www.marxismmadesimple.esmartweb.com/
Contains vast writings by and about Marxists, including the history, a library, and an internet archive. - Marxists Internet Archive
http://www.marxists.org/