It is high in protein and lower in calories than cream, but has lots of flavor and texture. I have made some amazing salad dressings with it. Add dill and you've got a cucumber dressing. Add your favorite fatty bottled dressing (like Paul Newman's Creamy Caesar) to extend it and cut calories. My favorite is to take a cup of kefir, add a couple tablespoons of mayo, a table spoon of prepared horseradish, pressed garlic, some favorite herbs and salt and pepper.
The other thing kefir does well is marinate bland chicken breast tenders. Just let it sit in the kefir for an hour, salt and pepper and dredge in panko crumbs and fry over a not-so-hot burner. Very nice and easy.