I found this on the American Diabetes Association website. It's a guide to portion sizes using, of all things, sports and game metaphors. Makes me want to eat a cup of pasta.
A serving of… Measures… And is about as big as….
Cheese - 1 ounce - Four dice.
Rice - ½ cup - Half a baseball.
Bagel - 4 ounces - A hockey puck.
Meat - 3 ounces - A deck of cards.
Peanut butter - 2 Tablespoons - A ping-pong ball.
Pasta - 1 cup - A tennis ball.