I'm not sure if docking to the right is really the best default; it really depends on your setup. On big, wide displays it's indeed a good way to do it. On small displays (notebooks) docking on the bottom is better. If you have multiple displays, detaching and moving the detached window to the other display works best. I think it's a good idea to assume the worst (tiny display) and dock to the bottom; the browser will remember your setting anyway so it's not like you'll need to do this all the time.
How many netbooks have anything other than a 16:9 display (even the MB Air 11")? Vertical pixels are precious in landscape mode. Dock to the side is far more efficient with current reality of displays.
Let's put aside any frustration that 16x9 is even usable much less desirable for any office work.
I don't know, I definitely prefer scrolling vertically (in both panels) on my MBA 11" to horizontally scrolling every time I need to read a line in its entirety. 680px wide just isn't enough for the inspector. That said, 1366x768 is certainly not on optimal resolution for development, period!
I agree with this sentiment. There's a certain width in pixels you need before things start to degrade. Most sites are already designed for a vertical scrollbar and almost never for a horizontal one, so even if docking to the right is a better use of screen real estate, if you can't get a comfortable thousand horizontal pixels it's not worth it.
