In a 9x13 inch baking dish mix wine and vanilla with peaches cut sides down. Marinate at room temp. for 1 to 2 hours, occasionally spooning juice over peaches to keep moist. Transfer peaches cut sides up to a platter; refrigerate. Pour marinade into small saucepan, stir in sugar. Bring to a boil and boil until reduced by half and syrupy, appx. 7 mins. Let cool to room temp. Serve with your favorite flavor of sorbet.