FCfree: US Airways' Airbuses offer 20 audio channels programmed by AEI Music. United offers about 12 channels (out of 18), programmed by Disc Marketing. Although US maintains the "barbaric practice" of charging $5 for headsets, their audio selections are much better than UA's.

bbinchi: United has 24 737-200 aircraft, and no immediate plans to retire them.
http://biz.yahoo.com/e/010405/ual.html