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LateDroid's JuiceDefender may have the silliest name of all these apps, but there's nothing silly about how it helps you save battery life. This is a very straightforward program with a simple interface. Whether you use its preset modes or you elect to tweak every setting to get the most from the program it's a simple way to save battery life.
JuiceDefender comes in three versions: Free; Plus, $1.99; and Ultimate, $4.99. The more you pay, the more control you get. I recommend starting with the free version and if you feel the need to tune your device for the greatest battery life you can always upgrade.
GO Battery Saver
GO Battery Saver is another do-it-all battery program that's easy to use. What I especially like about it is that it makes it easy to spot what apps are hogging the power.
Like JuiceDefender it comes in both a free version and $4.99 version which gives you more personalized control over your device's power use.
InfoLife's Battery Defender is another excellent free, battery saving program. I confess one its features I like the most is actually the simplest: It shows your battery life percentage on the notification bar. OK, it's not exciting, but I like knowing exactly how much juice I have left in my battery tank.
The price is also right: Free.