According to ESPN's staff, the Cowboys have bumped their roster total back up to 53 players, and raised it one.
Todd Archer has reported that the spot vacated by one Montrae Holland has been filled by G Derrick Dockery, recently released by the Redskins. Dockery has signed a one-year deal after visiting with the club on Saturday. He will provide some veteran insurance for the offensive line. As Archer's story illustrates, Jerry Jones recently gave Holland a signing bonus of $500K, indicating he had every opportunity to make this ball club before reporting to the team overweight and then missing time with a back injury.
Now, the Cowboys appear to have one too many players, after also inking a fullback, per Tim McMahon.
From the agent. RT @DennisBoyev: Cowboys have claimed FB Tony Fiammettaless than a minute ago via Echofon 
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Tim MacMahon
espn_macmahon
Fiammetta was recently cut loose by the Carolina Panthers, amidst reports of not seeing eye to eye with the new coaching regime. For all you folks that were upset with the Cowboys selection of released FB Shaun Chapas instead of the other more heralded fullbacks available, insert your rant here. The team will need to release another player in order to get back down to 53. This would seem to put the crosshairs on TE Martin Rucker, but we won't count the chickens before they hatch.
UPDATES: Per ESPN...
CB Josh Thomas has signed with Carolina. Fullback Chris Gronkowski, who was released Saturday, was claimed by the Indianapolis Colts on Sunday. Safety Andrew Sendejo, another player cut on Saturday, was claimed by the New York Jets.