The ibPopover control mimics the behavior of popovers introduced in OS X Lion. Basically it is a translucent window with an arrow pointing to the source it was opened from. Popovers automatically move whenever the main stack moves. ibPopover also allows detaching to become a separate window. When the popover is detached it will no longer be moved when the main stack moves. Closing the detached window will make it open in it's original position when it is invoked the next time. Nondetachable popovers cannot be moved.
More info and download at
http://bergroth.on-rev.com/ibTools