Other Groups Who Fly High-altitude Balloons

AMSAT has a list of high-altitude balloon Amateur Radio projects
http://www.amsat.org/amsat/balloons/balloon.htm

"AMSAT supports High Altitude Balloon projects since their programs seem to complement AMSAT's quite well."

Amateur Radio Tracking of High-altitude Balloons
Presented by Ian Kluft KO6YQ and Owen DeLong KB6MER
August 21, 2002
in Santa Clara, California at WVARA