Saw my first live trophy won by Arsenal there - the Mercentile Credit Trophy in 1988 - no European competition thanks to the scousers so the top 8 played each other in a knock out cup, which we won at Villa Park 2-1 from memory.
Also saw an FA Cup reply there v bin dippers after a 1-1 draw at Anfield when we had a stunning Marwood winning goal chalked off for no reason after outplaying Liverpool for much of the game (which paved the way for a more vital match later that season) then drew again at Highbury 0-0.
On scoring an equalizer our fans in the side stand (Doug Ellis ?) went bonkers and I actually ended up celebrating on top of the Liverpool dug out

A couple of Arsenal's most memorable goals have been scored there
Rocky with a typical spectacular goal at about 2.30 in a comprehensive 0-3 away win
http://www.youtube.com/watch?v=SOMZyqbKP5U
and Pires' sublime strike that Belfast Boy has as his avatar
http://www.youtube.com/watch?v=ELbLywum6ug
Anyone else got favourite memories re Villa park to share ?