I have started to create a plugin for the Eclipse IDE for AEL.
You are welcome to download it from my site (which is just starting out) at http://repo.ksatechnologies.com/AEL-Plugin.
The project itself is hosted by GitHub at https://github.com/TheGrandWazoo/AEL-Eclipse-Plugin. Please feel free to post request, ideas, bugs/issues to the GitHub project repo.
Nivek/The Grand Wazoo