OS X :: View Windows Full Or Partially Screened - Firefox - ITunes?

So here's something that's been on my mind for a while, but never figured it was worth while asking...anybody. But with Snow Leopard coming out tomorrow which feature Expose in the dock now thought i'd ask. I'm sure to some degree this question boils over as your personal productivity preference because i'm wondering what sizes your windows are normally at. For example, say you use Safari or Firefox; is that window taking up the whole screen? If so, why? Ever really think about it? Do you have it full screen cause you wanna surf the web and do your research or procrastinate at the biggest possible size available ...or.... is your Safari/Firefox window not fully screened, simply because you normally have more than just one Firefox or Safari window open, and it makes it easier to navigate multiple windows when they ain't taking up the whole screen?

For example, iTunes for me is possibly the only window I ever fully enjoy being full screen. I love cover flow so have a "space" (3) devoted to iTunes in full screen. In Space 2 (of 6) I have FireFox in full screen but many time throughout the day hate that it's full screen cause I easily need to navigate back to something else, such as the finder or w/e. Anyways, i'm really wondering what others do here, I think it'll be interesting to hear what's up. With SL coming out tomorrow i'm sure Expose in the dock will help big time, but nevertheless.