tooltips is fine as long as you make it something i can toggle on and off. after a while, they just get annoying.
unless you're going to make collapsable components, i wouldnt want to see a lot of info added to each component. the visual reference pane is fine. a number added would be fine. but adding a lot of extra text would be bothersome to me.
pushpins are ok, but the better way is movable, angled lines. you simply pick up a line and where you pick it up at creates a new angle so that when you can move the line at that point and place it down somewhere else and it saves itself to that point.
the other addition for easy tracing of lines is, when you click on a line it simply highlights brighter or even temporarily turns a different color. click a different line and your original turns back to un-highlighted or its original color.
pushpins, if you're going to go that way, need to be very well defined and can also cause their own kind of clutter. so, be a bit careful with these. i've seen pushpin tech used before that was disastorous in that one pin was used to vector multiple lines and that just doesnt work well.
craig
If wishes were horses... there'd be a whole lot of horse crap to clean up!
Craig