Structuralism and Poststructuralism:

http://www.brocku.ca/english/courses/4F70/struct.html  
Elements of Structuralism

http://en.wikipedia.org/wiki/Structuralism
Structuralism

http://www.cultsock.ndirect.co.uk/MUHome/cshtml/semiomean/semio1.html
Semiotics and Saussure

http://www.press.jhu.edu/books/hopkins_guide_to_literary_theory/prague_school_structuralism.html
Prague School of Structuralism

http://www.panam.edu/faculty/mglazer/Theory/structuralism.htm
Mark Glazer on Structuralism

http://www.kirjasto.sci.fi/rbarthes.htm
Roland Barthes' Ideas

http://www.brocku.ca/english/courses/4F70/poststruct.html
Post-structuralist Assumptions