Today in sports: Penn State has found Joe Paterno's replacement, Floyd Mayweather is starting his jail sentence, and Charles Barkley may lost his Weight Watchers endorsement.

First-year New England Patriots offensive coordinator Bill O'Brien has agreed to be the next football coach at Penn State. Inexplicably, the school is waiting until Saturday to make an official announcement, so in the meantime the news void is being filled with disgruntled former Nittany Lions players like Brandon Short and LaVar Arrington, who are outraged that Joe Paterno is being replaced by someone with no ties to the school and zero head coaching experience. Arrington told Rivals he's "done with" Penn State, while Short has somewhat hilariously secured a meeting with acting athletic Dave Joyner later this afternoon, where he'll presumably make a final appeal not to go through with the hire.  [ESPN]

Boxer Floyd Mayweather, Jr., is due to turn himself over to Las Vegas police today and begin serving his 90-day jail sentence, following his guilty plea on domestic violence charges last month. Never ones to miss an opportunity to make a mint, Mayweather's promotional team is already looking for ways to position him as a humbled man of the people when he gets released. If that's the case, they may want to tell Mayweather not to tweet anymore photos of his college football bet slips. Update: A Las Vegas judge has ruled that Mayweather won't have to begin serving his sentence until June 1, after the fight he has scheduled against somebody (maybe Manyy Pacquiao!) on May 5.    [Yahoo Sports]

Charles Barkley -- who is hosting SNL this week and just became a spokesman for Weight Watchers -- called the weight loss program "a scam" during a commercial break in last night's game between the Atlanta Hawks and Miami Heat. (He also talked about how much he hates watching the Hawks.) That sounds bad out-of-context, but it was said it with affection, though that probably won't matter to the Weight Watchers folks.  [NBA TV]

ESPN has signed a five-year deal for the broadcast rights to the New York City Marathon. The terms of the deal weren't released, but we wouldn't have gone higher than five bucks. [The New York Times]

Fox Sports is creating an original programming division, to produce sepia-toned documentaries to rival those of ESPN and HBO Sports. The first batch of programming -- which the network wants as bumper programming for NFL, college basketball, and auto racing coverage -- is slated to start airing in late 2012, or very early 2013. [Variety]