Organization. I had an aha! about organization today. The key to organization for people like me is the necessity to regularly reasses the actual facts against the intended/expected situation. This means, too, you have to think out what the intended situation will be, which is another weak point I have. Of course, this little realization of mine folds right back into my favorite koan. "First, clean your bowl."
Eh. Thinking about it, enlightenment--even just your garden-variety aha!--is different than insight. Enlightenment occurs to you; insight occurs to you so you can share it with someone else.