If you eat as many PB&J's as we do you may be as concerned as I was to find out the leading brands contain high fructose corn syrup and hydrogenated oils. A few years ago we switched to the natural variety to avoid these two ingredients.
While I prefer the "no need to stir" brands (Skippy and JIF both have one), some of you may be peanut butter purists and may like the kind that has to be stirred and refrigerated.
Because the oil separates with this type, it can be a royal mess when trying to stir and get the oil evenly distibuted. So here's the tip: Store the jar of peanut butter upside down. Most of the oil will be at the bottom of the jar, making it so much easier to stir.
I also recommend Grandpa Witmer's Old Fashioned Peanut Butter Mixer ($12, lehmans.com). I gave it to my mom for Christmas one year and she loves it.
I personally store my JIF Natural (no need to stir) upside down, as well, because minimal oil separation with any non-hydrogenated peanut butter is possible. I like the last bit to be just as creamy as the first.