Suppliers:

Balloons:
• Kaymont meteorological balloons
• Kaysam meteorological balloons

Helium:
• Airgas gas and welding supplies
• Praxair gas and welding supplise

Microcontrollers:
• Parallax (Stamp chips)
• Rabbit Semiconductor

Other Balloon Sites:

• Ralph Wallio (W0RPK)'s balloon site Launch info clearinghouse, flight records, lots more.
• AMSAT & High Altitude Balloons
• FAA FAR part 101 (federal regulations governing unmanned balloons, etc).
• Helium balloons for SFPA (photography)
• Balloon lift calculation
• NASA Ultra-Long-Duration Balloon program
• Near Space Sciences
• HABET
• Kansas Near Space Project
• High Altitude Balloon Launch Information Center
• Edge of Space Sciences, Inc.
• Other balloon links (NASA)
• WB8ELK's balloon (and other) links
• NASA's Scientific Balloon Program
• SimSat
• SimSat's links page
• WindTrax
• Balloon FAQ (N9LTD)
• Vernon Balloon eXperiments
• Minnesota High-Alt. Amateur Radio Balloon Project

Weather and balloon flight related:

• Upper air soundings
• Unisys upper air forecasts
• Windows Balloon Tracking Software
• Intellicast.com
• Accuweather.com
• National Weather Service Interactive Weather Information Network
• Weather.com (The Weather Channel)
• Weathertools.com (weather stations, etc)
• Weatherinstrumentmart.com (more weather stations, instruments, etc)
• Spaceweather.com
• Federal Meteorological Handbook #3

Electronics, Radio, Etc.:

• Tucson Amateur Packet Radio
• Parallax Incorporated
• Digikey

Parachute and parafoil recovery pages:

• Parachute design (model rocketry)
• Butler Parachute Systems
• JP Aerospace (rockoons)
• High-Altitude Parafoil Capsule Recovery System (HAPCRS)
• Guided Parafoil Aerial Delivery System
• MMIST Guided Parachute Delivery Solutions
• NASA SpaceWedge
• NASA X-38

High Power Model Rocketry:

• North Dakota High Power Rocket Group