Recently, I've been writing commentaries about as often as a song repeats on the Jack format. As a matter of fact, more stations will switch to the new "flavor of the month" than records will be repeated. By the time you finish reading this column, another station will have probably switched to the "Jack" format. Brilliant. For months, I've been writing commentaries about the dangers facing radio from satellite, iPods and audience lethargy. I have been waiting for one of the great programming minds of our time to come up with the magic formula that will help save the medium....