Hot Air Balloon Links
how the bottom of the balloon works.
http://ca.youtube.com/watch?v=eFqvGOx4t0k&feature=related
all ten videos on how hot air balloons work
http://www.expertvillage.com/video-series/469_hot-air-balloons.htm
how stuff works: hot air balloon
http://videos.howstuffworks.com/howstuffworks/43-how-hot-air-balloons-work-video.htm
different shapes
http://www.youtube.com/watch?v=zyyCcjbrWOM
http://www.youtube.com/watch?v=niaTYFIpnB0&feature=related
Misc.
man in chair and balloons
http://www.youtube.com/watch?v=tOqMBrTY89Q&NR=1
how things fly