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Crafty Apps EU's Tasker is more than just a battery program. It gives you excellent, detailed granular control. With Tasker you can automate what components and programs wake off and turn off by both time and location. So, for example, if I'm out at night, but I'm not at home, I can set it so that the phone is more "awake" then if I were home in bed.
Tasker also enables me to set my phone on how I want it to handle phone calls, media-play, texting, and other day-in, day-out processes. It's not hard to use, but it does require attention to get the most from it. Still for $2.99, if you're willing to put in the time to get it to work just right for you, you'll get a lot from this handy little program.