not a 100% sure but reacently leeds beat Manchester 1-0 !
Newcastle
Leeds United won the match by 2 goals to nil. It was the Football League Trophy North semi-final, played in Leeds on the 15th of December 2009.
Ye they beat the scum 1-0 !
Leeds United beat Arsenal 1-0
Chelsea 2 Leeds United 2 (Extra time played) Replay Chelsea 2 Leeds United 1 (Extra time played) Chelsea 4 Leeds 3
Huddersfield, who beat Preston 1-0.
Newcastle United FC won the FA Cup in the 1951-52 season, with a 1-0 victory over the previous year's winners Arsenal FC.
1988 3-1
According to soccerbase.com, Leeds have won 26 of their 106 matches against Man Utd (23 in the league and 3 in the FA Cup, including of course their last meeting in January 2010). Man Utd have won 45, and there have been 35 draws.
1988 3-1
Leicester City (in April).