Explore the evolution of front-end development in this 29-minute JSConf EU 2010 talk by Aaron Quint. Delve into the rise of jQuery, the emergence of new JavaScript frameworks like SammyJS, and the shift towards more sophisticated API designs. Learn about innovative approaches to nested callback structures, chains, and render contexts. Discover the potential of open-source projects like CouchApp and Sokka, which bridge the gap between Ruby and JavaScript development. Witness live demonstrations of CSS preprocessing with SASS and gain insights into testing methodologies for JavaScript applications. Gain valuable perspective on the rapidly changing landscape of front-end technologies and their impact on web development practices.