If you ever used Google Chrome - and you must have -, then you might have noticed how much vertical space you can gain by removing the window title bar. Yes Google Chrome has a titlebar, but as an extent of the tabs, so that's not conventional titlebar.

This can be very useful for a laptop, netbook and so on as you will gain a lot more usable space, but believe me, you will also notice the extra space on a normal desktop monitor.