Interface - I saw that for the first time in uni when we were being taught how to use a computer to edit video. Made no sense to me at the time, but soon after it really opened up a lot of people, not only skaters, as to what you can do with a decent computer editing system.
Sixth Sense - I loved the opening 16mm intro, the Kalis section and that montage to Fugazi. Good shit.
Modus - simple production, with one of the best line-ups ever.
Feedback, the Reason and Anthology also get worthy mentions.