I'm happy to inform you that Red Hat are providing free early access builds of JBoss Developer Studio 4 on the early access site.
JBoss Developer Studio is the supported IDE for doing JBoss Middleware development. It is based on Eclipse and the supported parts of the JBoss Tools project. The IDE comes with everything preconfigured and works out-of-the-box; making it easy to get started doing real work.
The current build is JBoss Developer Studio 4 M2 is based on Eclipse 3.6 (Helios), parts of the recent JBoss Tools 3.2.0.M2 release and with various updates to the 3rd party bundled plugins.
The early access site also provides access to JBoss Developer Studio 4 M2 bundled with JBoss Enterprise Application Platform (EAP) 5.1. To access these installers, you must be an existing Red Hat customer and/or participating in the early access program. Read more about the Early Access program here.
The site will be updated with future betas and more detailed info about changes/improvements in the near future.