We heard reports about Apple working on iNewsstand for iPad, to create a one-stop shop for newspapers, magazines issues and subscriptions. Right now the magazines on the iPad are still yet to really take off.
According to Apple Insider, they put several reports about the latest Sports Illustrated issue for the iPad that show the difficulties magazine face with Apple. It seems the SI iPad issue is only available in landscape mode and the reason for this is apparently to cut production cost.
Here, Sports Illustrated confirmed that Apple does not allow to offer iPad subscriptions at a reasonable price. That was the reason why they have to cut cost and only experiment with the format.