Preheat oven to 375 F degrees.
Slice twelve 1/2-inch slices of bread from the baguette. Place on a baking sheet, and brush generously with the olive oil. Sprinkle a little salt on each slice. Bake for about 10 minutes, or until crisp and slightly golden. Remove from oven and cool slightly.
Spread some goat cheese on each crostini. Spread about a tablespoon marmalade or honey on top of the goat cheese.
Fold the half slices of prosciutto and place on top of each crostini.
Lay a fresh arugula leaf (or two) on top of each crostini. Serve!