What determines how the scrollbar is rendered in OS X Lion? On my home and work machine, I see the scrollbar next to the content like this:
A co-worker, also running Lion has that same scrollbar overlaid ontop of the content (partially transparent), rather than in a "column" next to the content.
What determines which of these you get? Only difference I can figure out is because he's using a magic mouse, and I'm using a Logitech. Systems preferences for scrolling (in the general pref), we both have "Show scrollbars" set as "Automatically based on input device."