If you are planning to upgrade a JBoss 3.2 installation to JBoss 4.0, you'll want to check out the <a JBoss 4 upgrade guide. Michael Yuan has covered the major issues you'll see in the upgrade process. We've also updated the Application Server Guide, adding chapters on J2EE web services and Hibernate.

We'll have an update of the Getting Started guide later this week, so keep an eye on the docs page.