Just read about this on Twitter:
2010 12:25 PM ET
Also this tidbit: "In other Supe news, the show is on the prowl for an actor in his late 30s to mid-40s to play the recurring role of Christian. Described as “capable, calm under pressure, and very good at his job,” Christian has a special relationship with Sam and Dean."
Wouldn't it be cool if Joe was cast as Christian?