Does anyone have MSN 7? Despite its being insanely bloated and ugly, it does have a neat feature: the ability to send handwriting/drawings back and forth in a conversation window. That means you could have a conversation in shorthand! Though you do have to be handy with the mouse if you lack a tablet, I imagine it'd at least help make outlines more firm in your mind.
My address there is firstname.lastname@example.org if anyone cares to add me.