Jetspeed-2 is the next-generation enterprise portal at Apache. Jetspeed-2 offers several architectural enhancements and improvements over Jetspeed 1.0. First, Jetspeed-2 is conformant to the Java Portlet Standard and will provide a standard mechanism for the deployment of portlets. Second, Jetspeed-2 has matured to a more scalable architecture featuring multi-threaded functionality. Third, Jetspeed-2 is decoupled from several legacy open source projects. Fourth, Jetspeed-2 is based on a component architecture.
The first production release of Jetspeed-2 was released on December 8, 2005. Future development areas include improved caching and clustering support, further AJAX integration, new portlet applications, WSRP support, better design and use experience.
http://portals.apache.org/jetspeed-2/