I have noticed that there have been a number of inquiries about learning more about Objectivism. I'd like to recommend The Ayn Rand Lexicon edited by Dr. Harry Binswanger and published by New American Library. For those new to Objectivism or those don't have the time to do a lot of studying or reading, this is a sort of Cliff's Notes on Objectivism. I have found it to be invaluable not only for its information but for its references. (My copy is so worn it almost looks like its been in a shredder.)