Hacker News on 19 September 2007

• Joel explains how a new monopoly will emerge around AJAX
• What books would you recommend reading? Why?
• Paul Bucheit on safely storing user passwords
• News.YC in Polar Coordinates
• Fred Wilson: "Blown away" by Xobni
• An Intuitive Explanation of Fourier Theory
• Ask yc.news: Opinions on EC2?
• DHH: Sun surprises at RailsConf Europe 2007
• Ask YC News: Voting up vs. up and down
• Mint Wins TechCrunch40 $50,000 Award