Thanks to everyone on the site who helped me find La Tavernetta. I posted a question on the board. We needed somewhere near the Briar Street Theater, and La Tavernetta was one of the suggestions. It was wonderful - very casual Italian, excellent food. Great menu - not just the usual spaghetti Bolognese that you find all over. The only drawback was that it's BYOB, but there's a decent package liquor store down the street a bit. I will definetly be back.
Chicago is such a great town!