What are you doing at work that you don't want people looking over your shoulder? Serious question by the way - it always comes up in work environments that some people are pretty against the lack of privacy that comes along with these types of set ups, but really if you are at work there shouldn't be too much (if anything) on your screen which is private.
I'm a big fan of bull pen type environments, where it's wide open spaces and everyone is together with no walls between.
If you have that, and also offer a few "quiet rooms" where you can go if things are loud or you need to check your personal email, I don't see what the problem is.