This page is a transcript of a lecture on Aristotle's Nicomachean Ethics
http://www.mala.bc.ca/~johnstoi/introser/aristot.htm
It provides some introductory notes, an overview of the work and an analysis of the main themes.
This site
http://classics.mit.edu/Aristotle/nicomachaen.html
has the full text of Nicomachean Ethics as translated by W.D. Ross.
This site
http://www.cygneis.com/ethics/
has links to two articles about the Ethics. The first is a general discussion of the work and the second is an in-depth discussion about Aristotle's views on the relationship between law and morality.
This page
http://www.interlog.com/~girbe/virtuesvices.html
provides a table a of Aristotle's virtues and vices which could be quite helpful as a study tool.