Michigan Roman was recently mentioning how tired he was getting of the usual oil/vinegar salad dressings. Can't blame him; I feel the same!
If you're looking for great low-fat salad dressing ideas, you might want to have a look at Frederic Patenaude's new ebook: "The Top 70 Healthy Salad Dressings"
There's some really cool recipes in there, both from Fred's kitchen and other contributors: Ginger Oriental Dressing, Linda's Pear-Dill Dressing, Creamy Bell Pepper Dressing, Sunflower Sour Cream Dressing, Sesame Cumin Dressing, Almond/Ginger Dressing, Red Island Dressing, Raspberry Vinaigrette...
Anyhoo, you can check it out here