I posted yesterday that the GWT tutorial I wrote is now on the developerWorks. I didn't even realize it, but another tutorial I wrote was published last week as well. I wrote a tutorial on Geronimo plugins for IBM. It was actually a really fun tutorial to write. I think Geronimo's plugin architecture has a lot of exciting possibilities. In some ways it's a natural progression in terms of modularity. I always think of JBoss as folks who really recognized the possibilities opened up by making JBoss so modular via it's JMX based architecture. Geronimo's GBean architecture is a natural improvement, and it's what makes the plugin architecture possible. So check out the tutorial to see how easy and open the architecture is.