I was reading my one of my favorite sites today, one that tells you how to do anything from rolling a "left handed" cigarette, to building a CO2 laser for cutting materials. A beekeeper has posted an "instructable" on how to Build a scale to weigh bee hives.
http://www.instructables.com/id/Build-a-scale-to-weigh-bee-hives/ (http://www.instructables.com/id/Build-a-scale-to-weigh-bee-hives/)
At the end of his instructable, he gives information on a project by NASA collecting data about nectar flows and climate. It involves weighing the hives daily.
http://honeybeenet.gsfc.nasa.gov (http://honeybeenet.gsfc.nasa.gov)
No, I haven't started participation, I don't have any bees yet.