At 10:55 MDT, a United Express Beech 1900D and a Beech King Air struck each other while taxiing at Denver International Airport. No one was hurt. The United Express flight had landed and the King Air was taxiing for takeoff. The United Express pilot said he saw the King Air on his left side and applied maximum braking and full right pedal. The captain said it did not appear to him that the King Air pilot either saw him or slowed. The King Air departed Denver prior to the arrival of an FAA inspector and attempts to contact the pilot have been unsuccessful.