Dice tomatoes, and place in small bowl.
Mince 2 cloves of garlic, and add to tomatoes.
Finely chop basil, and add to bowl.
Add balsamic vinegar, a pinch of salt, and a few grinds of black pepper; stir well.
Cover and refrigerate for 2 hours.
After 2 hours, preheat a grill pan over medium heat (or outdoor grill).
Cut baguette into 1/2 inch slices.
Brush each slice with a small amount of oil.
Cut remaining garlic clove in half, and rub oiled side baguette slices with garlic.
Grill for a minute or two, or until golden brown.
Serve grilled bread and bruschetta, allowing each diner to assemble for maximum crunchiness in the bread.