There are still some companies that haven't committed to making the big drop. One is Whiting Petroleum ( WLL ), which the Wall Street Journal reported late last week has hired an investment bank to look at strategic alternatives, including a possible sale. It has a sizable midstream operation, including gathering and processing plants in the Williston and DJ basins, that would be prime for a master limited partnership. It could also simply be bought by a company like Anadarko, which could keep Whiting's onshore oil and gas properties and then drop its midstream assets into its already existing midstream vehicle.