Ubuntu 11.10's Compiz has been updated to 0.9.5 version bringing bug fixes and a new refinement to the Grid plugin (aero snap-like effect).
Compared to its Natty's version, now, when one push a window against the edge of the screen there is a fade effect (no more progressive zoom-like) and the color is brighter, making it very easy to observe and work with.
The shape of the expanded future window covers now the whole desktop (if you want to go fullscreen) and even the active window.