For a while now, I’ve been looking for more "customized" options for having my Mac wake "when I want it to," and sleep "when I want it to."
Mac OS X comes equipped with an Energy Saver preference panel, which allows some settings to be made, to specify when your Mac "wakes" each day, and then alternatively, when it "sleeps" each day:

I find these settings to be "somewhat" useful, but not quite enough. I’d like more flexibility, such as setting multiple "wake" times, each day. For example, I’d like my Mac to wake each morning at the same time, and then when I get home from work, each evening at the same time.
Power Manager may just meet my needs.
Via MacMinute.