Most of what could be said about this show has already been expanded upon in the comments. But the two most memorable moments, for me, were the fusion of sound and firmament.
1) As Phish began 2001, the sky was turning a soft pink, with scores of gray clouds hovering harmlessly above the festival grounds. The sun was sitting patiently on the horizon, ready to greet us all.
2) During Meatstick (reprise) and into "Here Comes the Sun" on the PA, the Florida sunrise was in full force and I remember feeling like I'd just woken up from hypnopompic dream. Everything was bright and beautiful, yet serene and foggy.
Fans will forever be arguing the merits of this show over another one. But apart from its length, the defining and unique element of this life-altering set was being able to experience dawn with Phish, their music, and 80,000 other people.