Reggie Bush has been one of the most productive running backs in the NFL during the first three weeks of 2008, and because of injuries to Marques Colston and Jeremy Shockey, the 49ers will pay special attention to the versatile back. "I think it's important right now to find out where he is on every play," Coach Mike Nolan said. "Everybody has to know where he is at all times because he does line up in the backfield, he lines up strong side, weak side, and he's very active in the offense."