Here's is a great all-purpose Italian vinaigrette with lots of herbs that my wife, LT, makes. We use it on salads, as a base for marinades, and on all manner of meats and veggies. For marinating ribs, I make a few minor additions.
Vinaigrettes are dressings made with vinegar and oil as a base. You can force them to get along with an emulsifier like mustard or mayonnaise. Here's the science of how it works.