Posted by ESPN.com's Heather Dinich
1. Georgia Tech: This veteran defense should help take some heat off the offense while it figures itself out. Senior tackles Vance Walker and Darryl Richard, along with defensive end Michael Johnson are legitimate NFL draft picks and should have their best seasons yet under first-year coordinator Dave Wommack.
2. Clemson: Three of the four starters return, including seniors Dorell Scott and Rashaad Jackson, and junior Ricky Sapp, who had 10 tackles for loss, five sacks and 22 quarterback pressures as a sophomore when he started all 13 games. And don't forget freshman Da'Quan Bowers, who will work his way into the rotation at defensive end with Kevin Alexander as they try to fill the void left by Phillip Merling.
3. Boston College: The Eagles had the No. 1 rushing defense in 2007 (75.5 yards per game), and that was without academically ineligible B.J. Raji and injured end Alex Albright, who had 8.5 sacks despite missing the last few games with a broken left forearm. Now they're back, along with senior tackle Ron Brace.
4. Florida State: Defensive end Everette Brown is the leader of this group and could be one of the best in the ACC. He led the team in sacks last year, when he was in a part-time role, and led all linemen in tackles and tackles for loss. Benjamin Lampkin converted from linebacker to end in the Music City Bowl. Budd Thacker started eight games last season and missed four because of an injury. Paul Griffin didn't start a game last year, but had 6.5 tackles behind the line of scrimmage.
5. Wake Forest: The Demon Deacons have to replace their top end in Jeremy Thompson, and fifth-year senior Anthony Davis, his backup, will inherit the job. Matt Robinson missed 2006 with a broken kneecap and then suffered a high ankle sprain last season and missed the three games. He was granted a sixth year of eligibility and will play as a grad student. Their strength will be inside with returning starter Boo Robinson at nose guard. John Russell is simmering with potential. Ted Randolph moved from tight end to defensive tackle midseason last year.
6. Virginia Tech: Only three ends with playing experience and one tackle return. Redshirt senior Orion Martin is the only returning lineman who started every game last season. Redshirt sophomore Jason Worilds should be No. 1 at the other end spot heading into fall and Nekos Brown and Steven Friday are competing for the backup spots. Demetrius Taylor has moved inside to tackle and will compete with John Graves, Cordarrow Thompson and a few others.
7. Duke: Junior tackle Vince Oghobaase is the real deal. He had 12 tackles for loss and 4.5 sacks last season. He's one of four returning starters, along with defensive ends Greg Akinbiyi and Wesley Oglesby, and defensive tackle Ayanga Okpokowuruk.
8. Miami: Hurricane fans have good reason to be excited about freshman Marcus Forston, but there's little that's certain about this line. Allen Bailey's move here from linebacker should help, but this offseason he's been slowed by a pectoral injury. Eric Moncur has struggled to stay healthy, along with Courtney Harris. Senior left tackle Antonio Dixon, Joe Joseph and Dwayne Hendricks are competing with Forston for the tackle spots.
9. North Carolina: The Tar Heels have to replace two of the league's best linemen in tackle Kentwan Balmer and end Hilee Taylor. There are plenty of options at tackle, where Aleric Mullins is a returning starter, but Taylor's absence will be felt. Darrius Massenburg broke his wrist and didn't participate this spring, Darius Powell is more of a third-down guy, and Vince Jacobs is a converted tight end.
10. Maryland: Jeremy Navarre is the veteran of this group, having started a team-high 35 games, and should move from end to tackle. Mack Frost is expected to take Navarre's end position, but he missed this spring because of knee surgery. Trey Covington has plenty of experience at the Terps' LEO position, which is a hybrid defensive end/linebacker. More is expected of nose tackle Travis Ivey, who played sparingly last year mostly in goal-line situations. Walk-on Bemi Otulaja passed him on the depth chart this spring.
11. NC State: Defensive end Willie Young and tackle Alan-Michael Cash are two certainties in an otherwise questionable line. While the move of Ted Larsen and John Bedics helped out the offensive line, it hurt the depth on defense. Markus Kuhn is a viable option at defensive end, and Antoine Holmes could help at tackle.
12. Virginia: With Chris Long and the lone answer to his departure, Jeffrey Fitzgerald, no longer on the team, the Cavaliers have a serious hole to fill, and there's not much experience at end to choose from. Alex Field played sparingly in every game and Sean Gottschalk played in nine.