The document covers the integration of Vaadin with Liferay 6, a Java portal platform compliant with the JSR 286 portlet specification. It outlines the necessary tools and steps to develop rich web applications as portlets using Vaadin within the Liferay environment, highlighting the features of Liferay IDE 1.5. Additionally, it mentions the upcoming features and enhancements for Vaadin and Liferay, emphasizing their open-source nature.