Time of Day based power settings? (Score 2, Interesting)

What I'd really like to see is power settings based on the time of day...

7:55a - wake the PC up, I'm coming into the office
8a-5p - High performance mode. Display off after 30min. Suspend/Hibernate - never

5p - Power savings mode. Display off after 10min, Suspend/Hibernate - 30min.

3a - wake up for downloading updates, virus scan, backup

4a - back to power savings mode.

XP and Vista don't have this. Not sure about Linux, OSX.

Are there any utility apps that can do this?
Can this be done via network admin?