Good news for Craigslist. On Tuesday a U.S. trade agency banned the sale of certain iPhone and iPad models for infringing a Samsung patent. The ruling by the U.S. International Trade Commission, if upheld by President Obama, would confirm that Apple duplicated the competition's technology in the older devices that function through AT&T's network, including the iPhone 4, the iPhone 3GS, and the iPad 2 3G. It will take effect in 60 days. Apple has affirmed it will appeal the decision.