The easiest way I've found, if it's totally global is:
in the app_controller, in before_filter do a $this->set('categories',
$this->Categories->find("all")); (make sure that you have a $uses =
'Category' (i believe that's the right syntax, and I also think there
is a better way to do this, I just don't remember it).
Then in the layout, use $categories however you want too.
You could also then pull the menu off into an element if you desire.
If you only want it to be on one controller, put the line in the
before filter of just that controller.
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