Attendees will be introduced to the Open Source implementation of the ECMA standards 334 and 335 by the Mono project. We will examine what Mono provides as a rich next generation developer platform including technologies such as MonoDevelop, Moonlight (opensource silverlight) and how these technologies can be used on operating systems other than Microsoft Windows. Attendees will be shown real-world examples of how programs can be rapidly designed and developed using frameworks like System.Windows.Forms and Gtk#. We will also provide an overview of the future of applicaiton development with advancing technologies such as GtkSilver.