The official beta release of ConfigMgr 2007 R3 is ready for public consumption, check it out here

Key features for this release are:

• Monitoring and Planning: The Power Management feature collects information about computer usage and power settings for computers in the origination.  Reports are provided to allow the administrator to analyze this data and determine optimal power management settings for computers.

• Enforcement: Power management allows the administrator to create power plans which can be applied to collections of computers. These power plans configure Windows power management settings on computers, and different power plans can be configured for peak and non-peak working hours.

• Compliance: After applying power plans to computers in the organization, the administrator can run reports to validate that power settings were correctly applied and to calculate power and carbon footprint savings across collections of computers.

Read the complete post at http://wmug.co.uk/blogs/r0b/archive/2010/04/22/configuration-manager-2007-r3-beta.aspx