Ask HN: Ownin LLC in USA for non residents

Hi All, I've been searching for various bits and pieces about starting LLC in USA (mostly to be able to sell Android applications). What are my options as non US residents who don't plan to go to USA anytime soon? What are the pitfalls of this approach? Which state should I choose? Does anyone have first hand experience or nice pointer to help me find a way through the forest of different information?