text:  Stocks drifted lower on Wall Street, erasing the S&P 500's gains for the week. S&P 500 slipped four-tenths of a percent. It is up for the second quarter and the year. NASDAQ fell seven-tenths of a percent. It, too, up for the second quarter and the year. The Dow slipped 45 points. It's down for the second quarter, but up 4% on the year. The Ravens have signed free agent wide receiver Keith Kirkwood, who last played for the Saints. Rookies report to training camp two weeks from tomorrow. And Albert Suarez is on the mound for the Orioles