Wall Street was largely held in check by disappointing numbers from the housing sector. The Dow and the S&P 500 were little changed, while the Nasdaq extended its rally to day number eight. Sentiment among the nation's hombuilders -suffering its biggest one-month pullback ever. The harsh winter is a factor, but that's not the only problem. Labor and land shortages are pushing building costs higher. Homebuilding stocks were down across the board.