I always saved the wav/mp3 and gif files of the ones I liked the most. I do this for all sites I like because inevitably, they vanish and rarely render correctly on archive.org.

My favorite was "amorningfilledwith400billionsuns" - or also known as "A Still More Glorious Dawn Awaits sagan" with the auto-tuned version of Carl Sagan singing about our possible future.

Hard to pick a single favorite actually. There were so many great ones.