I love Annie's Naturals line of dressings. In particular: Shitake Sesame (major yum) and Tuscany Italian.

This last time I bought a package of good seasonings and made my own with red wine vinegar and 1/2 olive oil and 1/2 water and I used some xanthum gum to thicken it, since I went light on on the oil. I am watching calories a bit. Anyway, it actually is delicious! Although I used a little too much gum so it is VERY thick!