Jakob Nielsen’s Alertbox lists Ten Steps for Cleaning Up Information Pollution .
All are fairly common sense. None of them are that hard to do. None of them would cost much, if anything, it practiced (and likely save money). Most of them should be standard policy for any non-Neolithic organization. Sadly few company teach good infomation habits. My picks for the practices with the most bang (effect) for the buck (effort): Don’t use “reply to all”, Write informative subject lines, Don’t circulate internal email to all employees.