The 49ers have been one of the easiest teams to exploit via the slot for the last two years, and Carlos Rogers has been teetering on the brink of mediocrity despite his impressive 2011 interception total. Assuming Nmamdi Asomugha makes the team, I think you have a good competition between him, Brown, and Culliver for the two starting spots on the outside. The loser of that battle will still see action in nickel and dime.
What we need is someone to push Rogers for that slot position and possibly win the job. Especially with Percy Harvin coming to town and Welker and Amendola on our biggest AFC rivals. Looking at MadDog's boards, it seems the 2nd round is a sweet spot for good cover corners who can play slot right away.
DJ Hayden, Robert Alford, BW Webb, or Leon McFadden. Whether at #34, #61, or via trade, I really think we should draft one of these guys.