Specifically, from VT, I've adapted the following (basically I simply
eliminated the oil they listed):

 Garlicky Caesar Dressing
--------------------------

4 - 5 cloves mashed fresh garlic
1 tsp. good red wine vinegar
2 tsp balsamic vinegar
1 Tbls. lemon (preferbly fresh)
1 tsp. water
1/2 tsp. dry mustard
1-2 drops hot pepper sauce

Mix or blend all ingredients together.


When I eat out, I always order their lowfat  salad dressing on the
side  and either vinegar or lemon.  Then I mix about 1-2 tsp of the
lowfat dressing with the straight vinegar or lemon.  This adds lots of
flavor and additional "cling" with just a little bit of fat.