The single biggest change to green enterprise IT is to ensure that desktop computers use effective power management. This can be introduced at minimal cost on existing equipment using just software changes = No hardware purchases required. There are a number of tools available to do this. The better tools support directory integration, per-user / per-machine management, scheduled power settings and reporting features. Data Synergy???s PowerMAN tool is a popular suite that gives IT staff all the tools they need to quickly and effectively deliver enterprise wide power management.