1Bring first 5 ingredients to simmer in heavy small saucepan over medium heat. Reduce heat to low and simmer until glaze is reduced to 3/4 cup, stirring occasionally, about 10 minutes. (Glaze can be made 1 day ahead. Cover and refrigerate.)
2Prepare barbecue (medium heat). Brush corn with some of glaze. Grill until lightly charred in spots, turning frequently, about 8 minutes.
3Transfer corn to platter. Brush corn with remaining glaze. Sprinkle generously with salt and serve.