In a small sauce pan, on high heat, bring water and sugar to boil. Stir to dissolve the sugar.
Add in cranberries, and return to boil. Lower the heat and simmer for about 10 minutes.
Remove from heat and let cool completely at room temperature. The sauce will thicken as it cools. Set aside.
In a large skillet, on medium heat, add turkey sausage and sage. Cook until sausage is browned and thoroughly cooked. Be sure to break up sausage when cooking. Season with salt and pepper to taste. Drain any excess grease and set aside.
In a medium bowl, combine cream cheese and sausage. Top each crostini with sausage mixture and cranberry sauce.