Anyways, I recently updated this collection over the new year (with a bit of help from two students). It's not meant to be a comprehensive list of all best paper awards, but a fairly representative one across the main conferences in computer science. I guess I think of it as the Oscars (Academy Awards) of Computer Science Papers. It originated because award announcements and conference websites disappear quickly because each year a different organizer manages the website, so this information is lost forever. And I wanted a way to look back and see what people thought was the best paper in that year to see if those paper indeed made an impact.
Those who are more quantitative may be interested in this aggregated list of which institutions produce the most best paper awards: https://jeffhuang.com/best_paper_awards/institutions.html And the interesting thing that came out of it is the number of best paper awards is highly correlated with the US News ranking of computer science departments (which is purely based on subjective surveys of department chairs and graduate directors): https://drafty.cs.brown.edu/csopenrankings/