Warren Buffett’s Berkshire Hathaway (BRK/A) made an interesting move today, offering to exchange stock in Phillips 66 (PSX) for a pipeline-services business.  PSX stock has been a real winner since being spun-out of Conoco Phillips.  This deal for PSX is a way to unveil additional value in its various operations, which it doesn’t view as being properly valued by the current price of its stock.  Berkshire obviously sees an attractive business that can be bought at a reasonable price.