Throw your Newman's Own out the window. The best salad dressing you make is your own, and to do that you need is this Mini Measure Bottle.
It has eight different dressing recipes printed on the outside of the bottle, measurements and all. And it's only 10 bucks. At that rate you're saving money since you don't have to buy the grocery store stuff. Want a balsamic vinaigrette? Fill up certain ingredients up to the white lines, and add the other necessary accoutrements, portions of which are listed on the Mini Measure. Shake it up, and you're on your way to an awesome salad. No Paul Newman concoction required. [Amazon, Mini Measure]