Although it is always good to have an ample battery supply on hand for devices like remote controls, smoke detectors, and some toys... I recommend people strongly consider recharable batteries for things like cameras, handheld video games, RC cars etc, etc.
I purchased a few packages of the Energizer AA batteries for use in my daughter's handheld leapfrog video game and for her remote control Barbi car because the regular AA's just didn't last very long. If she left the car on it would burn through a set of batteries in a day even while sitting in the same place.
Now, when the battery level gets low I just pop them into the charger and a few hours later they are as good as new.
Rechargeables aren't ideal for everything and their cost is far too high to use them exclusively, but they can be useful in many situations. Considering how many regular batteries one set of rechargeables will replace they are clearly the better value.