This document discusses why Lombardi built their Blueprint product using Google Web Toolkit (GWT) and why developers should use GWT. It provides an overview of Blueprint's history and development with GWT. It highlights key features of GWT like compiling Java to JavaScript, hosted mode for rapid development, and widgets. It also discusses optimizations in GWT like deferred binding and how GWT can generate faster JavaScript than what developers would write by hand. Specific examples are given around rendering diagrams efficiently and handling events. The document concludes by recommending developers try Blueprint and read their blog to learn more about developing with GWT.