'Could Kant have been a Utilitarian?' http://deontology.com/
Provocative extract from the book Sorting Out Ethics by the late R. M. Hare. "Kant, I shall argue, could have been a utilitarian, though he was not. His formal theory can certainly be interpreted in a way that allows him - perhaps even requires him - to be one kind of utilitarian."
Classical Utilitariansm http://www.la.utexas.edu/cuws/
Contains selections from the writings of the classical utilitarians -principally Jeremy Bentham, John Stuart Mill, and Henry Sidgwick- with commentary thereupon.
Utilitarian.org http://utilitarian.org/
An explanation of what utilitarianism is, its strong relationship to altruism, and a place to network to put the philosophy of utilitarianism into practice and thereby make the world a better place.
Negative Utilitarianism