Word on the street is that Melky has been sent to Scranton, and Richie Sexson has been released.

Gardner has replaced Melky on the roster and bats 8th tonight, and Cody Ransom has been called up to replace Sexson. 

I think this is referred to as addition by subtraction. 

Gardner is fun to watch when he gets on base every other game, and at least Giambi can now play against lefties I would hope. 

http://yankees.lhblogs.com/2008/08/15/melky-optioned-sexson-released/