The Surface object lets you display a modifiable image in your application. You can draw to it, transform it, or adjust the brightness - There are many possibilities which make this object highly flexible. If you are familiar with the Overlay Redux object, make sure to try this object.

A beta version of the Flash port can be found here.

Minor update - Probably not needed by many.

"Blit > From the surface > External > Active" was removed. It was an experiment of mine, and I forgot to remove the menu entry.
Thanks to LB.

Blit from/to window now support AND, OR and XOR blit modes, stretching and source regions.