My all time favourite was when we beat the Cup Holders Arsenal 3-1 at the old Highbury ground. I wasn't even meant to be going but got offered a ticket and lift down on the morning of the game and it was certainly well worth it!
I went to Bury the last time we played them and we won 2-0, I think there were more Bolton fans in the ground than Bury and the away end was bouncing.
I did used to go to more away games when i was younger on the official travel club coaches and remember us beating Preston 4-1 at Deepdale on their infamous plastic pitch.
My worst away game would have to be Man Utd away when that dirty bastard Jonny Evans practically ended Holden's career. That was the start of the slide for me as we never recovered after that.