Dolphins - look great, top 5 defense, tough against the run, added Seau so should be even better than last year, great run team, solid backup QB, iffy WRs though and its a passing league
Chargers - stud WR in Boston, now defenses cant stack the box like last year, LD should have an even better year than last year. Should have a high powered offense and they'll need it with thier Defense.
Buccs - They want Philly to release Staley, if the Eagles do and the Buccs pick him up, I'm predicting another Super Bowl. Even without him, I think they've got a chance to repeat. They barely had a ground game last year and they did pretty good.
Panthers - If they get some good QB play, dont rule them out.
I think the Steelers starting Zeroue over Bettis is a great move, even though I love the Bus. Amos fits thier new offense better, plus it leaves Bettis fresh and rested for when the Defense is starting to get tired in the 2nd half. His durability wont be as much of an issue, and he's going to be playing against fatigued players more often.