Provide your own keybinding category
 

Don't know if this has been "documented" somewhere or is just widely known anyway, but here goes.

The new keybinding UI has nicely separated categories, and you may have your own for your addon's bindings. Just specify the category attribute on each binding to be included in the category. It will load a global or a string, like some other XML string attributes. Custom categories are placed at the bottom, above "Other".
You may also combine it with the existing header attribute.

Personally I hope people won't use their own categories if they only have like a coupla bindings, though.

That's a neat find.

I think they should renamed "Others" to "Addons" personally. Will there ever be Blizzard bindings in that category? If not, it'd make more sense to name it "Addons" so a user knows that's where to go to set addon bindings.

Yes, maybe. Everything that doesn't have a category will go there. I guess they're not gonna put anything there. Especially as they already have a "Misc" category.

Oh, this is nice. Before anything gets established, I'd like to propose that everyone put your addon's bindings in the "ADDONS" category (yes, all-caps, it's a Blizzard global string that contains the translated word for "AddOns" in the user's language) unless you have a large number of bindings (eg. Bartender4) in which case they should go in their own category. Thoughts?

Yeah that would work nicely. If there was enough addons doing it, it would be expected of addons to put stuff in the AddOns category.

I'll be sure to add category="ADDONS" to my addons' bindings.

Also posted this over on WowAce to spread the word, though those forums are basically dead these days:
http://forums.wowace.com/showthread.php?t=21715

Made a post on the official enUS forums also:
http://us.battle.net/wow/en/forum/topic/14419602093