I was here on 9/11/01. And I just remember the reaction from everyone on here. Even this forum stopped for at least one day.
I also remember starting my first countdown here. I sadly don't have the countdown archived, but I do remember some of the songs that were on it. My taste has improved so much in five years, I would think.
And, of course, I remember being there when the Your Top Ten forum really began to take off. That was a beautiful time.