Estelle Weyl is a front-end engineer who has been developing standards-based accessible websites since 1999. She writes two technical blogs pulling millions of visitors and speaks about CSS3, HTML5, JavaScript and mobile wed development at conferences around the world. Maximiliano Firtman is a developer focused on mobile and RIA development. He is a professor in web and mobile technologies, and founder of ITMaster Professional Training. He is author of many books in Spanish, including books on Java ME, ASP.NET, AJAX and Professional Web 2.0. He is founder and manager of ARFUG (Argentina RIA & Flex User Group), an official Adobe User Group covering many RIA technologies, including AJAX, Flex, AIR and Silverlight. He has spoken at conferences in Spanish and English and published dozens of articles in magazines (.CODE, Users) and online (MaestrosDelWeb, Forum Nokia). He has been a Forum Nokia Champion since 2006, and has developed many mobile projects as MobileTinyURL.com and widgen.com. He is an expert in AJAX, Adobe Flex, Java ME, Widgets for Mobile and iPhone development.