not betting the pot

[sisyphus]

"I heard a teaching tape on no-limit hold’em whose main point was that the proper size bet in many situations is less than the size of the pot, and not the full size of the pot. Even though this statement is true, it is not likely to improve the play of a group of people whose number one failing is betting enough to protect their hand."Internet No-Limit Hold'em by Bob Ciaffone,.....
I would be interested to hear examples of hands/draws, where it could be deemed correct to bet less than the pot....Hope this isn't too general.