Business Week | By Meena Krishnamsetty and Matt Doiron, MarketWatch Here are the largest holdings by Berkshire Hathaway as of March 30 that had value-investor appeal due to their low P/E-to-growth ratios. Warren Buffett's holding company, Berkshire Hathaway (BRK.A), filed its first-quarter 13F with the Securities and Exchange Commission last month. We've found that 13Fs can be used to develop