Obvious drop off at QB, but as others have said Boeckmans been around now for awhile, and then you have Robby and Henton..
Pittman, Chris Wells, Mo Wells, and the addition of Saine
Ginn & Gonzo (im keeping ym fingers crossed still) but if they both go.. Robiskie, Hartline, Small, and Dukes/Lyons
The O-Line will improve, IMO
And then on D, we'll have one of the best groups of DBs and LBs in the country as well as the emergence of Washington, Rose.. and Gholstons back. Thats a freak front 3 in a year, lacking only experience.. but with an awesome back 8, i have confidence that Heacock will have the silver bullets in typical form.
All kickers are back..
While the loss of Troy Smith can't be understated, we could see a very dynamic running game with a solid passing game helping to keep the defenses honest if nothing else.
The biggest key to next year, IMO.. is the lasting effect of this year. By that i mean after Troy and the seniors go, they have helped the freshman, sophmores, and juniors buy into what JT has been preaching and when the entire program has bought into a concept, it just dosen't go away in one off season.
Only time will tell, but the Buckeyes will have an explosive ground game with deadly options at reciever again, and a typical mean, fast, hard hitting defense.