Well I don't really have an introduction. I hope I anger the homers out there.
Saints
SB champs. Only notable losses are Mike Bell and Scott Fujita (and Jamal Brown though he didn't play a snap last year). I doubt they'll be repeating though since Brees has been hexed by DAT MADDEN CURSE.
Packers
Rodgers is proving that he is elite. The O-Line was getting better as the season was closing and if that carries over into this year, we might see an even better offense. The defense needs to take it up a notch though and show that it can handle top offenses.
Cowboys
Very good team all around. The three headed back, Jason Witten, and the potentially deadly duo of Miles and Dez is scary offense. They had a top ten defense last year and will probably stay that way this year though they need better safety play.
Vikings
I'd have Minny here whether or not Favre came back. Rice and Harvin are a great duo for T-Jax to work with. AP will need to stay healthy now though with Chester Taylor gone. Also, Jared Allen beating up on decent O-Lines (instead of just bad ones) could help them a lot.
49ers
Alex Smith was getting better as the season went on. A full year with Vernon Davis, Crabs, and a healthy Gore should make this offense great. The bolstering of the O-Line with two big name rookies helps too. Coupled with their top ten defense, this team is suddenly a contender.
Falcons
Losing Matt Ryan and Michael Turner for a chunk of last season doomed them from being a WC team. This year, Turner is back in the best shape of his life and Ryan is 100%. The only question lies in their secondary. It was weak last year and signing Duntae Robinson who has been on the decline doesn't seem like enough. The offense will really have to turn it on if they want to go deep into the playoffs.
Panthers
The Panthers seem to rely on QB play to determine if they're any good or not. If Moore and Clausen are game managers with D-Will, J-Stew, and (hopefully a healthy) Steve Smith, this team should do fine on the offensive side of the ball. But losing Julius Peppers hurts them as he was the only source of sacks. Someone needs to step up in the pass rush if they are going to keep their status as a top ten defense and WC contender.
Eagles
The big question marks here are Kevin Kolb and LeSean McCoy. They are both big pieces to the puzzle and entering their first years as starters. Kolb is surrounded by weapons with D-Jax, Maclin, and Celek so it should open up the running game, but they have to hope McCoy is ready for the full load. Adding Brandon Graham and Nate Allen should help in the pass defense too.
Cardinals
Losing Kurt Warner basically sealed the 2010 fate of Arizona. Matt Leinart hasn't played well in his chances. No more Boldin doesn't help either. They are getting better with the run game though thanks to Beanie Wells and the addition of Alan Faneca. On defense they added Kerry Rhodes and Jerry Porter while losing Antrel Rolle and Karlos Dansby. Probably looking at a sub-500 season.
Giants
The Giants suffered a Mets-like collapse last season, finishing 3-8. They need Jacobs and Bradshaw to turn it up to help Eli Manning is his great group of receivers. Over on defense they added Antrel Rolle who makes their safeties infinitely better than last season. However, the Giants really aren't spectacular at anything besides the air game and I don't see them making a playoff push like they seemed to do at the beginning of last year.
Bears
Oh, Bears. Gave up your future for a QB that threw 26 INTs. Cutler still doesn't have a #1 WR and the O-Line hasn't improved. Forte needs to recover from his sophomore slump in a bad way if that offense is gonna be worth a damn. On defense, Peppers will probably give 50% since he's past pay day but a healthy Urlacher could possibly inspire the group. I don't see this team doing much.
Redskins
This team won't be good as long as they continue to acquire washed-up famous players. McNabb only has Santana and Cooley to throw to which is garbage compared to his options in Philly. Four running backs who are old and no longer relevant will not help him either despite Shanahan's genius. This team is doomed. At least they have Orakpo and Carter getting sacks.
Seahawks
Hasselbeck and Whitehurst are their QBs. Not a good thing. If they want to have a halfway decent offense they NEED to start Forsett. Over on defense they have Aaron Curry, Kelly Jennings, and Lawrence Jackson who are all colossal busts. Just a really poor team all around besides some bright spots like Tatupu and Carlson.
Lions
Well they are certainly trying to build an offense. Stafford showed flashes of brilliance against poor teams, they have an elite WR, they can abuse two tight end sets with Pettigrew and Scheffler, and Best is a great pick at RB. However, their defense is atrocious. Adding Suh and Vanden Bosch should help a bit but in next year's draft, they HAVE to get O-Line help and more defense if they want to make a playoff push in the near future.
Bucs
No running game. No receivers for (a potentially good) Freeman besides Winslow. They are certainly building a defense for the future with McCoy/Price and their good pair of safeties in Jackson/Piscatelli. But until they get some offense, they are doing nothing in a strong and balanced NFC South division.
Rams
The Rams are depressing. Steven Jackson is rotting out there all by himself. I'm not sure Bradford is ready for the NFL yet and he really has no one to pass to besides Avery, who would be nothing more than slot guy on most teams. They have no defense thanks to awful picks like Chris Long and Adam Carriker the past few seasons. These guys are going nowhere for awhile.