Rationalism 

Catholic Encyclopedia: Rationalism

Rationalism: A brief overview.

Rationalism & Skepticism Links

Continental Rationalism (Internet Encyclopedia of Philosophy): A concise overview.

Moral Rationalism (Internet Encyclopedia of Philosophy)

Christian Rationalism

Rationalism - The Intellectual Bedrock of Secularism

Modern Philosophy: The Philosophy of Rationalism (The Radical Academy)

The Secular Web: An interesting site.  Worth a look if you are interested in contemporary applications of philosophy.

"John Locke: The Case Against Innate Epistemic Principles": an essay about Locke's arguments against the rationalist position of innate epistemic principles)