Deniol Graham.
In 2009 it was Robin van persie.
As at 6-Jan-2010, Arsenal's leading goalscorer is Cesc Fàbregas with 12 goals from 22 appearances.
1963/64 season Denis Law scored 46 goals in a season.
Ross MacCormack with 9 goals so far
Paul Scholes is currently the top English goalscorer in the Champions League.
He was never a prolific goalscorer, but he did do a good job at holding the ball and allowing a strike partner to put several in the net. This was until he moved to Australia, where he was the top goalscorer for his debut season.
Paul scholes
Benzima
Wayne Rooney
Rooney
Wayne Rooney
Ince