There are so many great options.  I like to serve mine with a variety of side dishes but these are some of my favorites.  Decadent Make-Ahead Mashed Potatoes are always great and can be served as a bed for the balsamic short ribs.  Another option is my Whipped Roasted Garlic Sweet Potatoes.  Braised short ribs with risotto is another favorite combination.  Buttered egg noodles and a roasted or steamed veggie would also work.