Seth says "I Want an Outliner for Code Writing" so I wonder if this snippet from Eclipse 3.0 M9 News will be of interest:

..."The Java editor now supports folding of code regions. Hovering over a folded Java element lets you peek at the hidden code:...

Currently, import statements, comments, types and method bodies can be folded. These, and whether folding should be enabled on new editors can be configured on the Folding tab on the Java > Editor preference page:...

Other plug-ins may contribute additional folding structures and their preferences using the org.eclipse.jdt.ui.foldingStructureProvider extension point."...

It doesn't appear that the editor is an outliner in the true sense of the word but perhaps it's a good starting point given that extension hook.

I'm just off to download M9 - toodle-loo!