Samuel Greenfeld | Dox Yourself
This talks starts out by looking at how companies have tried to authenticate people using public information. It then looks at current authentication practices, and finishes by discussing how companies try to determine who you are without letting you know.
Samuel is a Senior QA Engineer testing XenDesktop performance at Citrix. Prior to that he worked on the One Laptop per Child project, and at Secure Computing & McAfee on the Sidewinder (McAfee Firewall Enterprise) product line.