Development is done in Eclipse 3.1. The website is generated by Maven 1.0; at present, the builds for the plugins are done manually, but will be automated in the near future. You can download the coding guidelines as an Eclipse Preferences File which can be imported directly into Eclipse 3.0 or 3.1.
Window -> Preferences -> General -> Editors -> Text Editor -> Dislayed Tab Width) and the formatter
(Window -> Preferences -> Java -> Code Style -> Formatter -> Tab Size)