Update [2006-1-23 13:53:32 by Grizz]: Found a confirmation article here and here.
Radio station 1310, the Ticket, is reporting that Cowboys LB coach Gary Gibbs will be joining Sean Payton and the New Orleans Saints as their defensive coordinator. I haven't found any links to articles supporting this, but it's a good bet considering all the chatter over it in the last week.
Replacing Gibbs could be current Cowboys TE coach Paul Pasqualoni or possibly Jim Herrmann from Michigan. USA Today reported this item last week.
Pro Football Weekly has this tidbit in its "The Way We Hear It" section:
Miami is following up on the Redskins lead in assembling a staff of "name" coordinators. From ESPN we learn they hired Mike Mularkey as offensive coordinator and Dom Capers as defensive coordinator.