The green button at the top of every window is actually called the “Zoom Button”. In some applications it actually does maximize the window. Then, in some like iTunes, it changes the interface from the full iTunes layout to the mini-player. In other apps, it just resizes the window to what Apple thinks is the best ‘fit’. To say this is a bit confusing to recent switchers is putting it mildly. So – lets fix that button once and for all.
Right Zoom provides a quick and easy solution for the zoom button’s inconsistent behavior. It enables you to make the zoom button maximize to full screen when you click the green orb.
* RightZoom (Free) – PowerPC Friendly / 10.5 Leopard / 10.4 Tiger available on this website – Download Here
MAC POWERPC 