How about Geronimo Wiki,
"cwyou" <> wrote in message news:005001c40030$bccd2e10$
    I am very interested in Geronimo project, but it is keeping to change. Is there any other resources, like documentation or experience from others, about this project? Or, is there any other J2EE books that talk about this, especially the way how to deploy a new service or other components into Geronimo?
Thanks a lot..