Dividing good old macaroni and cheese into categories--traditional, international, and today --Joan Schwartz provides 52 recipes for all tastes--as long as they combine some kind of macaroni with some kind of cheese. Recipes include Italian (Farfalle al Quattro Formaggi) and Greek (Pastitsio), Baked Conchiglie with Roasted-Garlic-Cheese Sauce from Bobby Flay, and Green Chile Mac and Cheese.