I've written here quite a bit about my basic hatred for open offices. My personal opinion is that open offices are masked in lots of terms about "information flow" and "collaboration" when the reality is that it's about companies being cheap. I also went to a high school built originally on a completely open plan. At some point they realized teachers shouting over each other didn't work, or the teacher next door givi…
Why do 1-3 people offices inhibit communication? I can't see it. You can also have a central or conference room for communications, or coffee corners connecting the offices. I think, Joel Spolsky has shown a real good example: http://www.joelonsoftware.com/articles/BionicOffice.html His office does give both: Everybody can retreat, but also a huge area to communicate, live and exchange in community.
Central conference rooms are critical, but don't lend themselves well to casual, quick communications.