Product Owner Room
The Product Owners at Sipgate have organized themselves around a large set of whiteboards on which they track and plan the work for their Releases. This is a great way of getting immediate visual understanding about how you can realize your Release Goal.
On the first whiteboard they put the Requirements they'll be working on in this release, decomposing them in Minimal Marketable Features (sets of User Stories) which they can then plan in each Sprint. Each Sprint has it's own whiteboard again, so it's very easy for them to move stories from one sprint to the next.
A bonus tip from the Sipgate PO's: if you're planning to replicate this setup at your company, don't screw down the whiteboards to the wall. Keeping them freestanding allows you to move the boards, so you can easily move a planned board down and put an empty board besides it. This way you can plan 'current' and 'next' sprints without having to move all your stickies from one board to the next.