Here's a look at how the four teams in the NFC North have fared in free agency this offseason.
BEARS
Key additions: WR, Brandon Marshall (trade), RB Michael Bush, QB Jason Campbell, WR Devin Thomas, WR/KR Eric Weems, LB/ST Blake Costanzo
Key losses: RB Marion Barber (retired), CB Zack Bowman, CB Corey Graham
Analysis: The Bears got better on offense with the additions of Marshall and Bush. In Marshall, the team has a legitimate No. 1 receiver for the first time in over a decade. The Bears were 7-3 and on their way to the playoffs before they lost quarterback Jay Cutler and running back Matt Forte to injury. They won just one game the rest of the way. The additions of Campbell and Bush help with depth.
PACKERS
Key additions: DT Daniel Muir, C Jeff Saturday, DE Anthony Hargrove
Key losses: QB Matt Flynn, C Scott Wells
Analysis: The Packers were 15-1 last season and weren't in a situation where they had to search the free-agent market to supplement losses. All of the Packers' core pieces are intact for 2012. Muir and Hargrove add depth to the defensive line and Saturday will help fill the void of Pro Bowl center Scott Wells. The Packers re-signed tight end Jermichael Finley, which was an important move, too.
VIKINGS
Key additions: OL Geoff Schwartz, CB Zack Bowman, CB Chris Carr, TE John Carlson
Key losses: G Steve Hutchinson (release), G Anthony Herrera (release), NT Remi Ayodele (release), TE Jim Kleinsasser (retire)
Analysis: Hutchinson has been a fixture on the Vikings' offensive line since 2006 but was a salary cap casualty this offseason. Schwartz was a free agent target of a number of teams, including the Lions. Carr should get some decent playing time on passing downs, Bowman is a terrific special teams player and Carlson can be a steady weapon for quarterback Christian Ponder. These addition won't wow anyone, but they're solid.
LIONS
Key additions: DE 
Key losses: CB Eric Wright
Analysis: Much like the Packers, the Lions are a playoff team now in a position to try and hang on to their own good players. The Lions re-signed receiver
Around the NFC North:
Preseason schedule for all NFC North teams
Kevin Seifert – ESPN.com
Bears' Drake high on potential of WR Thomas
Vaughn McClure – Tribune
Brian Urlacher wants to finish his career with the Bears
Sean Jensen – Sun Times
Driver continues upward arc, scores 26 on "Dancing with the Stars"
Duke Bobber – packers.com
S Nick Collins to meet with Packers next week about neck injury
Rob Demovsky – Press-Gazette
Hargrove could energize Packers' defense
Tyler Dunne and Bob McGinn – Journal Sentinel
Vikings 'Top 30' pre-draft invitees begin arriving
Mark Craig – Star Tribune
Vikings say all is positive with Harvin and Peterson
Dan Wiederer – Star Tribune
Vikings stadium could get second House committee hearing Thursday
Doug Belden – Pioneer Press
