There are some applications that I like to use in Mac OS X’s full screen mode, especially applications that I have running all the time but only occasionally reference, like iTunes, Yojimbo, and NetNewsWire. These are also applications that have been designed as single window apps, and they work quite well that way. I would never use, say, Adobe InDesign in full screen mode, because that wouldn’t jive with all of the palettes. I use three displays, after all.
And then there is an application like Apple Mail. It’s mostly designed to be a one-window application, and that works fine for reading mail in full-screen mode. However, when it is time to create a new message, that pops as a new window. In full screen mode, it becomes a modal in the middle of the screen. It covers up whatever is in the main window, such as the message you are replying to, and you can’t move it.
If you want to reference something in another mail message—a very likely scenario—you have two options: take it out of full-screen mode or press the Cancel button. Now, as it turns out, when you press Cancel, it prompts you to save the message. You can find it again in the Drafts folder. That’s not exactly intuitive.
So, while I want to treat Mail as one of the other single window applications that I run all the time and occasionally reference, running it in full screen mode is just a hassle.