The Steelers have liked what they have seen out of rookie QB Dennis Dixon and RB Rashard Mendenhall so far this preseason.  Dixon is really a super athletic QB but it might take him a little while to improve his passing accuracy.  Still, he has a good arm and he will be able to learn from Ben Roethlisberger and Byron Leftwich this season while holding a clipboard.  Dixon has completed 12 of 24 passes (50%) so far this preseason for 109 yards without either a TD pass or an interception for a QB Rating of 62.7.  Dixon has really looked good when he takes off running out of the pocket as the has carried the ball 2 times for 54 yards (27.0 ypc) with a TD.  Rookie RB Rashard Mendenhall has been running hard this preseason so far but he’s not getting a lot of yards.  He has carried the football 18 times for 64 yards (3.6 ypc) with 1 TD run.  He will likely split carries with Willie Parker this season getting a lot of touches near the red zone.