IBM intends to propose the AJAX Tool Framework project as part of the Technology PMC. A brief description of the project is below and a draft project proposal has been posted .

AJAX Toolkit Framework (ATF) will provide extensible frameworks and exemplary tools for building IDEs for the many different AJAX runtime offerings (Dojo, Zimbra, etc) in the market. These frameworks will contain features for developing, deploying, debugging and testing AJAX applications. Tools built upon these frameworks will initially include: enhanced JavaScript editing features such as edit-time syntax checking; an embedded Mozilla web browser; an embedded DOM browser; and an embedded JavaScript debugger.

The AJAX Toolkit Framework will be built using several Eclipse Web Tools Platform (WTP) project components. IBM will make an initial code contribution that will encompass the core functionality for the AJAX Toolkit Framework project including an enhanced Javascript editor, integrated XulRunner based Mozilla environment (which supports JavaScript debugging and DOM inspection among other things), extension points to plug-in arbitrary AJAX runtimes like Dojo, and adapters for both JSP and PHP.

An initial prototype is planned in 1Q2006. Additional contributors from outside of IBM are now being sought so this is a good time to get in on the ground floor.

If you need AJAX support today, you may also want to check out MyEclipse Enterprise Workbench 4.1 which supports many AJAX related features now.

Resources:
Draft AJAX Tool Framework proposal