Apple leaks new scroll bar UI details in Mac OS X 10.7 Lion
Apple's chief executive Steve Jobs specifically highlighted a few new user interface changes coming in the next release of Mac OS X, but his presentation also revealed additional subtle but significant changes to how scroll bars work in the new Mac user interface.
http://feeds.appleinsider.com/click.phdo?i=52c8ddca7c0c0e773c0ae256eb0b3d30