Jim Tressel's resignation was likely triggered by the impending publication of a Sports Illustrated article on Ohio State and violations of NCAA rules taking place under Jim Tressel's supervision. While no one outside of SI has gotten a look at the article, one thing is certain: George Dohrmann is the writer, and that means nothing good for Ohio State even with Tressel's resignation this morning.
Dohrmann won his Pulitzer in 2000 for reporting on academic fraud in the Minnesota men's basketball team, and has continued his investigative streak by writing about the Mike Vick dogfighting scandal, NCAA violations in the Arizona men's basketball program, and as if that weren't enough, has also written about the Barry Bonds steroid case. If the content is a mystery, the credentials of the writer involved are beyond established at this point.
Dohrmann himself tweeted this morning that the story would be published later today or tonight, so for the moment he's like the rest of us: waiting for the SI editorial staff to dot the i's, cross the t's, and show the world the final nail in Ohio State Jim Tressel's coffin.