Once you start acquiring planets, and building many ships it becomes very difficult to keep track of where everything is and where it's needed. The map view is too cumbersome for this purpose, and the planet/ship views are not as helpful because everything is broken down individually.
What I think would be great is a systems menu. It would display every system in which you have planets or ships. It would show every planet and ship in each system at a glance. It could have factory icons for the planets showing open and occupied factories, show trade and harvesting routes for each planet, etc. All in one place. I have a bunch of other ideas for this, but I don't want to go overboard too much unless it's something people are interested in, so what do you think?