From ProFootballFocus's list of top FA tackles:
8. Bryant McKinnie
2012 Grade: +5.6
2012 Snaps: 418
Summary: The Super Bowl run may have been the last ride for a number of veteran Ravens. As Bryant McKinnie hits the open market it’s a pertinent to question whether he has anything left in the tank for another go. He struggled all season with fitness and motivation which led to the Ravens using him sparingly until Week 17, at which point he became an integral part of their run to the title.
McKinnie has never been a great “effort player” but he is an excellent pass protector who understands where he needs to be and how to get there to neutralize even the best of pass rushers. If he has the motivation to stay in shape for another season, then someone should get at least one quality season of play as a potential holdover to a longer term solution.
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I'd try to sign him to an incentive-laden contract, stop gap till next year's draft / time for martin to develop. Winston was somehow left out of this article..