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No, I don't think the Steelers really need another safety, although you can never be too sure.
I actually like Atogwe as a part-time corner. I could see him being a potential answer in nickel and dime packages or, if he really takes to the position, as a starter opposite Ike Taylor.
I know I'm asking for a big leap here, but the Steelers would be the team to pull this off. Atogwe needs to revive his career after an injury-filled 2011 season. In Pittsburgh, he could learn the new position from Carnell Lake, secondary coach and, as a player, a veteran of the same kind of position switch.
When healthy and on his game, Atogwe can be a playmaker. That something the Steelers lack in their cornerback department. It could be a low-risk signing that ends up paying dividends.