Comment 4 for bug 930682

WIndow snapping is available for ages, it was there in Compiz 0.8 for sure. If by "window snapping" you mean Grid plugin, it's available in 0.8 too in some form; however, we won't implement something that's not consistent between window managers. So we will either use a WM-independent solution (e.g. http://www.webupd8.org/2011/04/set-up-hot-corners-edge-flipping-in.html), or not use it at all.
Metacity does not give nice window shadows because it draws them for composited windows, so e.g. Slingshot looks horrible.