Melt butter in a skillet. Add garlic, and sauté just until fragrant. Remove from heat; cool. Place bread cubes in a large zip-top plastic bag; add garlic butter. Seal bag, and shake to coat. Add herbs and salt to bag. Reseal bag, and toss well. Arrange cubes on an ungreased baking sheet or jellyroll pan. Bake at 375°, stirring occasionally, for 10 to 12 minutes or until crisp.