How can I save a vertical (not horizontal) multiple display arrangement? I have two displays. Mac OS X frequently "forgets" the digital arrangement of the monitors and defaults them to a horizontal side-by-side arrangement. This does not correspond to the physical arrangement of the monitors.

In this arrangement, my desktop is extended upwards, not to the left or right.

How can I save the arrangement?
Stay is a pretty cheap app who's primary purpose is to save default positions for applications of screen, and automatically be able to rearrange them to this default state.

However, it has multiple display support, and as a side effect, it can be used to restore previously used display arrangements.