Pierre Loti and Sichuan spot Land of Plenty are two) to present diners the option of ordering a smaller portion at the listed menu price, and "giving half" as a donation to a hunger-fighting charity instead.
Founder Wayne Wu worked as a consultant and was dismayed by the wasted food he saw while eating out on the road four days a week. He figured there were plenty of other people out there who would prefer a smaller portion - and the chance to fight hunger (via donations to the New York City Coalition Against Hunger and WhyHunger) with the dollars that would've been spent on the extra food. The company is launching its beta pilot next month with an iPhone app and mobile site that will allow diners to access restaurants' "give half" option from their phones. For now, you can sign up for that trial, or suggest restaurants that might want to participate, at givehalf.org.