A couple of other places to try inside the walls are Bini pasticcerie, 91-93 Via Stalloreggi, and Nannini's on Via Banchi di Sopra. Both have out-of-this-world sweets, for breakfast, midday, dessert after dinner, anytime! And of course just about all bars have a selection of sweet pastries, and some like one of our favorites, the Quattro Cantoni at the corner of Via di Citta and Via San Pietro, have a wide selection to choose from. But get there early!
And don't forget gelato! Our favorite spot is right off the Piazza del Campo, on via di Citta -- you can't missi it it's just next to the wide opening that leads onto to the Piazza! They have a great little terrace that overlooks the Piazza -- just look for the big sign that says "Artiginale"!