Arsenal v Man Utd (and the reverse) always used to be my favourite fixture of the year that Spurs weren't involved in. 98/99 cup semi final replay, 6-1 in 00/01, Wiltord WUMing the home support a year later winning the league there and then, the catastrophic Barthez errors before that, the Veron Scholes league combo avenged by that miss by Giggs in the cup in 02/03, Keown serenading van Nistelrooy, the Battle of the Buffet, "shouting your mouth off you!".. Because Arsenal were so far ahead of Spurs in those days my teen resentment of them was more based on collective envy (with my Dad) rather than an actual rivalry as seems to be happening now. I was almost a part time Utd fan with this inherited envy.
Can't remember much else bar Arsenal winning both games in their first season at the Emirates, and the infamous 8-2 this year (Spurs' hammering by City was categorically not redeemed by that game, before you ask).