In a bowl, mix the tomatoes, basil, cheese, and garlic. Mix in the balsamic vinegar, olive oil, salt and pepper. Allow mixture to marinate together for about 15 minutes to allow all of the flavors to mingle.
Slice your baguette into 1/4 slices and arrange on a cookie sheet. Brush lightly with olive oil and place in oven until lightly toasted. Depending on your oven, this should only take about 5 minutes.