The Saints racked up 577 yards of offense en route to a 49-24 trouncing of the Giants on "Monday Night Football."  Drew Brees threw for 363 yards and four touchdowns for the NFC South-leading Saints, who have won three straight to improve to 8-and-3.  Brees also had a rushing score.  Jimmy Graham and Lance Moore each had a pair of touchdown grabs, while Mark Ingram rushed for 80 yards and a score in the one-sided affair.  Eli Manning passed for 406 yards, two touchdowns and an interception for the reeling Giants, who have dropped three in-a-row to fall to 6-and-5.  Victor Cruz had nine catches for 157 yards and two touchdowns in the lopsided loss.