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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.