The Red Sox had Crisp under their control anyways, they are probably just paying him about what he would get in arbitration so neither side would have to worry about his status.
I'd imagine Beckett is their next priority. He's controlled through 2007, so if possible it would be good to extend him this year and not even let him come close to free agency. He seems like the type of guy who prefers an environment like Boston, so I can definitely see it happening.