I use OmniGraffle for such things on a Mac. Many people seem happy with the drawing packages in their word processor or presentation program, though. The advantage of an object based editing program is that you can keep arrows connected as you drag things around.
I use OmniGraffle for such things on a Mac. Many people seem happy with the drawing packages in their word processor or presentation program, though. The advantage of an object based editing program is that you can keep arrows connected as you drag things around.