The 2011 NFL Draft saw Baltimore take Jimmy Smith with their first-round pick to add to a secondary in need. There are still issues remaining amongst the back line of the defense, but they can be alleviated by helping the pass rush up front.
Looking to free agency for that need isn't smart because there isn't a player who's a star on the edge. As Pittsburgh has shown, having someone of LaMarr Woodley's caliber is just as important as having James Harrison.
The need of pass rush for Baltimore is even greater with Terrell Suggs tweaking his right hamstring. Just having Suggs to get to the quarterback isn't near enough anyway. Baltimore needs to call around the league in search for someone who they can plug in from Week 1 on the outside opposite of Suggs.
Cliff Avril from Detroit could be a nice signing but his impact wouldn't be great enough for a veteran defense that needs to win now. San Francisco's Manny Lawson would make a decent add for Baltimore's 3-4 look, but he'd still be somewhat of a project. And thinking Sergio Kindle will be enough pass rush for the team will mean Baltimore's season ending with a loss to Pittsburgh yet again.
Elvis Dumervil from the Denver Broncos is someone the Ravens could seek. The team is in rebuilding mode and his cap number isn't friendly for Denver. Baltimore has already shown interest in Osi Umenyiora, but the issues between the Giants and Umenyiora may be resolved and New York may be seeking a first-round draft pick for him.
Many more names could be found for the Ravens to look into. The onus of finding an additional sack artist is on them because there isn't one currently on the roster good enough to play across from Terrell Suggs.