Jeff Barr from Amazon Web Services is leading a couple of sessions on Tuesday to talk about how Web services play a role in enhancing Web applications. This is a short video preview. Jeff's first talk will be at 10:30am and focusing on Amazon Mechanical Turk -- a new Web service that allows .NET software developers to incorporate the power of human decision-making into their automated software systems. Jeff's second session will focus on building a search engine and give an overview of the Alexa API and how developers and designers can get on the new, leveled search playing field.