From the press release (thanks to Baseball Digest Daily for the update):
KANSAS CITY, MO (July 24, 2006) - The Kansas City Royals traded right-handed pitcher Mike MacDougal to the Chicago White Sox in exchange for left-handed pitcher Tyler Lumsden and right-handed pitcher Daniel Cortes, Royals Senior Vice President-Baseball Operations/General Manger Dayton Moore announced Monday. Lumsden will report to Wichita (AA), while Cortes will report to Burlington (A).
This is supposedly the first step in acquiring Alfonso Soriano, with MacDougal replacing Brandon McCarthy in the bullpen. Stay tuned.