400,000 New York Times readers have sponsored a student subscription. Quite an amazing example of voluntary pricing. They use the following denominations: 10, 50, 100, 250, 500, 1000 dollars. Some humble advice to NYT: anchor your visitors by starting with 1000 so the 100 looks smaller. Great idea to get quality content to a new demographic - although I am afraid we will see a problem with actual payment later if they received it for free.