[tehwalrus]

Hover-focus is great on tiling window managers, but I'm not sure I'd react well to it where windows overlap by design.

Also, don't forget that OS X lets you scroll whatever window your mouse is over, even if it is "blurred" (not in focus). This is the one feature that I miss most whenever I need to use Windows.

[chimprich]

There's a couple of free Windows programs that compensate for this. http://superuser.com/questions/110700/making-a-mouse-scroll-...