Peel eggplant, if desired, and cut into 1/4-inch cubes. (You should have about 5 cups.) In a large skillet heat olive oil; add eggplant and onion. Cook, uncovered, over medium-high heat about 10 minutes or until tender, stirring occasionally. Stir in tomatoes, red wine, vinegar, capers, salt, and pepper. Bring to boiling; reduce heat. Simmer, uncovered, for 10 minutes or until liquid is evaporated. Cool slightly; cover and chill at least 3 hours.
Before serving, slice baguettes; brush cut sides with a little olive oil. Arrange slices in a single layer on the unheated rack of a broiler pan. Broil a few inches from heat for 2 to 3 minutes, turning once. Serve with eggplant dip. Garnish dip with fresh thyme, if desired. Makes about 4 cups (sixty-four 1-tablespoon servings).