http://arxiv.org

This site is pronounced “archive.org” as if the x were the Greek letter Chi, but it shouldn’t be confused with archive.org – home of the Wayback Machine.   This site is a nerd paradise courtesy of Cornell University.   Quoting from the site, arxiv.org offers “Open access to 736,347 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.”