Lower calorie salad dressings

[babybat]

I'm trying to increase the amount of veg in my diet at the moment, and having a side salad with lunch/dinner is a fairly easy way for me to do that. My go-to salad dressing is a Dijon vinaigrette with olive oil, cider vinegar and mustard, but I'm getting a bit bored of the same old thing. Any ideas for tasty but not too calorific salad dressings I can make?

Low fat yoghurt with your favourite spices and herbs.
Finely grated orange zest and juice of a fresh orange.

Google Jamie's no fat salad dressing, it's my default.

ToesInWater that looks really good, will give it a try!
Ada - hadn't thought of oranges, although lemons are a firm favourite, so will give them a go. Any others?