I have reached the point in Open Outpost where I am going to start expanding the UI past a right click menu. I can go about this in one of two way:
The traditional game UI where all the little widgets are contained in the master window.
or
Have game windows be actual windows on the desktop. The biggest advantage to this is it can take advantage of any dual monitor real estate with what ever graphs or information panels you want to keep open. The other advantage is it allows you to do other things (chat online, do homework, whatever) without running a traditional ui in "window mode."
If I have an infinite number of monkeys in front of keyboards I'd do both, and maybe will at some point. Right now I'd like to see what the community preference is so I know which to tackle first.