Putting the start together for an index that lists all the feats that have Combat Expertise as a prerequisite, all feats that actually interact with the Combat Expertise feat, all base classes and base class ACFs that interact with it, all prestige classes that require it, all prestige classes that interact with it, and all items that interact with it.
And one of these days I ought to ask dndtools if they want some help adding more things. I'll learn enough HTML to code new pages (or at least make new ones from templates) if that ends up being what works best.
Edit: I might end up adding everything that works for fighting defensively too since that ties into Combat Expertise.