This is simple tip for City of Heroes. This one is pretty trivial and more in lines of "stuff I think about that nobody else would."

In City of Heroes, your mission map can do more than just tell you where you've been. The way things are set up, it can also tell you how much further you have to go and in what general direction. This is most useful on those map types that don't have elevators (caves and warehouses etc.). Those missions with elevators breaking the map up only really give away information for the current "floor". 

The key thing you need to understand with your mission map is that it defaults to full zoom-out, fully visible, and exactly centered on your map display such that one dimension is fully extended.

I'll give an example. Here's a map at the beginning of a mission.

You can see from this map that it is going to be relatively narrow and from the scale, you can see that it's not going to be that big. Most exploration will be to the West and North.

Here's the finished map that bears this out.

Sure enough, a jag West then North.

The main use I have for this kind of information is that when I come to a junction, I can tell which end will likely be longest and I can start on the short side (if I'm going for a complete exploration of the map) or start with the one likely to be longer (if I just want the end goal and don't care about being thorough).

So what this tip comes down to is saving me some back-tracking through empty hallways.