A somewhat related question: I'm about to start a job at a company with "open office" structure, after having my own office for the last 4 years. Anything I should be prepared for? EDIT: Any headphones suggestions?
Pay attention to who the rest of the office does or doesn't attend to when that person decides to convene a huddle or start soapboxing - regardless of the topic
Dutifully working away under your headphones when a ranking person is looking for attention is a great way to end up labeled in a bad way.
* Don't mistake an open floor plan for an open structure. Be careful about who you accept work from / collaborate with / delegate to until you understand the landscape.