I like to have a staff forum and then and admin forum, I also would create an office type board for myself where I can topics with new idea and create to do lists.
In the hidden depths of Forum Promotion, we actually have a good 40 staff and special boards. They range from each team's staff rooms, a general staff room, team leaders, admins, etc.
I have a main staff forum and an admin forum, eventually once the groups start expanding and members start rolling in, I'll have a board just for each staff group, however for right now it's not really needed since most of the staff know what's going on in each group, and I honestly think it's better that way until each group starts needing their own space for their own threads.
What we refuse to do is have an "office" for each admin, since it's really not needed. We put all of our drafts, news, and discussions in a admin board and that's it, it enables the admins to collaborate more, and it just saves space and clutter later on down the road.