That\'s the big problem with The Gimp, its almost unusable at a resolution less than 1280x1024 due to those huge menus. You could just close the less immediatly useful windows and learn to use the keyboard to key them back up (Shift+Ctrl+B for the Brushes, for example; if its the same on Windows).
Anyway, you should see me using The Gimp on my iPAQ\'s 160x320 screen... Talk about cramped, yet, strangly, it just feels so right...