One of the things that has never changed in any version of Windows is the “Minimize, Maximize and Close” Buttons on a window, its always on the right side. If you want some change to this, then this application is for you.
LeftSider is a tiny program that lets you move “Minimize, Maximize and Close” Buttons to the left side of a window.
On running LeftSider an icon will be placed in the system tray so that you can move buttons from right to left or vice versa any time.
It runs on Windows XP, Vista and Windows 7.
Download: LeftSider