Sam's off, probably on a recruit thing, so Marcus Ray is filling in for him. Marcus had his ups and downs, but he always had an excess of personality, and BTN is missing out by not adding him. (Plus who can resist the Wolverine from Columbus for commentary?)
Besides tuning in (there's only an hour and a half left) you can listen online at www.wtka.com, or listen to the podcasts any time at http://www.wtka.com/pages/9395307.php (or click on above link and podcasts tab). I'd suggest you listen to his recruiting segment, where he talks about hosting players, and how it's different at Michigan, as well as seeing recruits come in like Woodson, Manning, Shaun Alexander (didn't like him), and the best, David Boston (who came in saying he was going to Ohio State and nearly starting a fight...and how that played out in 1997). Speaking of Charles, Ray's next segment is an interview with Woodson, the first time they've ever been on the air together. (But that one isn't up on the podcasts yet, but I would expect it's going up shortly).