I am a big fan of Report 103, a weekly newsletter from jpb.com (subscription information can be found at http://www.jpb.com/report103/).  In the most recent edition, the author suggests writing down ten of the most fundamental changes you could make to your business without destroying it.  Once you've completed this task, try to make an objective and convincing argument why you shouldn't make the change.  If there are one or two fundamental changes you can't make a compelling argument against, give them a try.