I was told by a friend that cheddar cheese contains no lactose.  I tend to disregard most things people say these days because of the amount of disinformation contained in email forwards, web forums, and Facebook.  But it turns out this one is true: 

Most of the lactose found in cheese is removed with the whey during the manufacturing process. Most ripened cheeses, such as Cheddar and Swiss, contain about 95% less lactose than whole milk. Aged cheeses contain almost no lactose.

That's good news for cheese fans who are intolerant of lactose.