Almost all Windows applications remember the maximize state of their windows the next time they start up. I've noticed that this is not true for pgAdmin; by default it always starts up non-maximized. Changing the shortcut's properties to force maximization works for the main window, but new query windows are still non-maximized.
This is a minor issue, but saving the maximize state is a very widely-accepted convention. Windows users are accustomed to closing a maximized window by moving the mouse to the upper-right corner of the screen. A window, i.e. a new query window, that always starts up non-maximized can be irritating, because the usual gesture to close it ends up closing the application behind it instead.
Using version 1.10.0 (also present in 1.8.4) on Windows XP Pro SP3