I just watched the one on the Nintendo World Championships: http://www.gametrailers.com/video/nintendo-world-screwattack/719815 I was there actually. One of the semi-finalists, Worcester, MA 1990. I was 13 years of age then. Was fun.
Yea. My mother took me. We lived in a city near Boston so it was close by. Attended for three days. I did not know about those cartridges until a long, long time later. I remember being on stage twice, in the king's chair once (for having the highest score of the seven on stage), the Zelda play, and the games. I have a few pictures Mom took of the event. Good times, good times.