This new monitor configuration keeps popping up the engineering team and after walking into enough offices thinking, "Useful or flashy?", I decided to give it a whirl.
The basic usage pattern is unchanged. The left screen is for the active workspace whereas the right screen is the palette screen -- utility windows like calendar, Twitter, instant messaging, and stickies which require a glance now and then, but aren't playing in the primary workspace.
The little things will make me stop and go 'duhhhh'; it's so obviously a keen idea. Of course having two monitors is useful - and of course rotating it 90 degrees makes a lot of sense.