Top Ten Web Hacking Techniques of 2009 - Jeremiah Grossman

"The diversity, volume, and innovation of the research was impressive. Competition was as fierce as ever and the judges had their work cut out. Rich Mogull, Dinis Cruz, Chris Hoff, HD Moore, Billy Rios, Dan Kaminsky, Romain Gaucher, Steven Christey, Jeff Forristal, and Michal Zalewski were tasked with ranking the field based upon novelty, impact, and overall pervasiveness."

These were certainly some of the most memorable, innovative techniques found in 2009 among the security community.  Research like this helps to better security in the products we use and rely upon.  It is definitely a good read.