Netzke is a library that allows creating full-featured client-server GUI components - such as data grids, forms, windows, trees, etc - which then can be easily used as building blocks for complex enterprise applications. It uses Ruby on Rails at the server-side, and Sencha Ext JS in the browser. The choice of Ext JS provides for consistent look and feel, as well as for painless reusability of third-party Netzke components. Most importantly, Netzke allows for writing clean and highly maintainable code, which almost doesn't grow with the number of data models being used. After a brief introduction to the basics of Netzke design, some cool code will be shown from a fairly complex real-life web application, which will demonstrate a few highly practical aspects of Netzke.