[lennie]

Don
You may want to sit down and detail you business process workflow. Define each step of your process and define responsibility; You can do this in omnigraffle for a graphic representation, omnioutliner if an outline approach is more your style, or even in word or other text program.
You can build templates for each department in OF and as your business grows assign the templates to new departments. To be sure a project is not dropped between departments create a task to notify the next department of the handoff (e.g. Service finishes job have a task to notify finance to initiate billing).