Time to start the ball rolling on the planet screen, since we've already got threads for research and ship design screens.
My take so far:
1) Clicking on a translucent "under construction " improvement on the map should select that item in the queue, so it can be changed or cancelled easily. As it is now, if you have many of the same item scheduled, you have to dig through the list until you get the one you're looking for. Would be nice as well if you could simply press the delete key or something on your keyboard to cancel a queued improvement after selecting it via the map.
2) This one's an error: some low-quality planets are getting generated with mismatched globe and tile-map images (one I saw had a red mars-like globe, but the map was that of an "ice planet", with just snow and rock areas.
3) I think it's been mentioned already, but there should be some sort of queue for ship-building as well. Though there's not really any place for that on the planet screen at the moment, and it would probably be more at home on the shipyard screen. Still, it would probably be helpful to show smaller icons for queued ships in the ship constrcution gauge (once queueing is actually added, that is).