At work I create a lot of flowcharts, e.g. http://www.freshfreestuff.net/wp-content/uploads/2008/05/gli... . I usually use Gliffy or UMLet. The problem is, all of these have drag-and-drop interfaces where you have to use the mouse all the time-and moving back and forth from the mouse to keyboard is painful for me. It also means that making flowcharts takes much longer than necessary-it would be really useful to have sane default keyboard shortcuts like "create a node beneath the currently selected node."
So some method of using, say, Gliffy without having to use the mouse would be awesome.
Disclaimer: I am not a programmer and have no idea how interesting this is, I can only speak to how much it would help me.