Trader Joe's Fat Free Balsamic Vinaigrette salad dressing is by far the tastiest fat free salad covering I've found. Cheap, too. The balsamic vinegar flavor is quite good, and there don't seem to be any off-flavors. Highly recommended.
My latest discovery makes me roll my eyes in pleasure. Sometimes I have to wipe them if I eat too much. It's Trader Joe's Wasabi Mayonnaise. Just delightful! So far I've only used it to help moisten tuna salad sandwiches, but it clearly belongs with lots of fish dishes. Chicken, too, probably. I'll have to experiment boldly with this ever-so-delectable condiment.