Jello Fluff

Ingredients
2 small boxes sugarfree Jello (your favorite flavor)
1/2 cup skim milk
1 envelope Dream Whip
1/2 tsp. vanilla

Procedure
Prepare Jello; chill until almost firm.
Prepare whipped topping mix according to package directions, using skim milk & vanilla.
Fold whipped topping into the Jello slowly.
Chill for 2-4 hours.

Sometimes I make this with 1 1/2-2 cups drained crushed pineapple in it's own juice. I use the drained off juice to flavor the jello.

Also I suppose you could use fatfree frozen CoolWhip (thawed) instead of Dreamwhip, although I've never tried it yet, myself.