The Ayn Rand Institute
http://www.aynrand.org/site/PageServer?pagename=index
The comprehensive site of the nonprofit organization which "works to introduce young people to Ayn Rand’s novels, to support scholarship and research based on her ideas, and to promote the principles of reason, rational self-interest, individual rights and laissez-faire capitalism to the widest possible audience." Includes articles and extensive commentary, essay contests, resources for educators, and information about speakers and events. A good place to find articles arguing the objectivist point of view.
Internet Encyclopedia of Philosophy's Ayn Rand page
http://www.iep.utm.edu/r/rand.htm
The IEP's page on Ayn Rand includes a very clear and succinct statement of her main ideas. This is an excellent place to start any Ayn Rand research, as it covers the story of her life and a thoughtful discussion of her works.
The Ayn Rand Society
http://www.aynrandsociety.org/
A professional organization for academic philosophers. Scroll down for a scholarly overview of objectivism.
The Ayn Rand Lexicon
An online version of Harry Binswanger's book cataloging Ayn Rand's system of thought. It includes an alphabetical index of terms and concepts, which can serve as a companion to Rand's works.
New York Times article 9/15/07
http://www.nytimes.com/2007/09/15/business/15atlas.html?pagewanted=1&_r=1
An article published commemorating the fifty-year anniversary of the publication of Atlas Shugged. An interesting capsule of Rand's life and work, it includes statements by successful executives of why the principles of objectivist philosophy worked for them.