Mark Hendrickson, who was rumored to have signed over a week ago, still hasn't officially been placed on the roster. Assuming he is, that is one less available spot in the bullpen.
In case you were wondering, Dennis Sarfate was the player chosen to be designated for assignment to make room for Miguel Tejada. No one claimed him and he was sent to Triple-A, but will still have a chance to compete for a relief role.
News is slow these days...
UPDATE: Of course, a few hours later and the O's sign Hendrickson, designating reliever Armando Gabino for assignment. They also signed Will Ohman to a minor league contract, who will compete for a spot as a left-handed specialist.