I have been on a low-fat diet for a while and I finally found a really great low-fat mayonnaise. It is called Mayoli and it is made with olive oil instead of regular oil. It is also cholesterol-free! Anyway, they have a website which also has some low-fat salad recipes and dressings. I have made a few of them and they came out nice. By the way, the website is www.mayoli.com
For those people who don't like the taste of low-fat mayo: try mixing it with the same quantity of low-fat sour cream... For some reason, I find the taste of this mixture much more pleasant :-)