Some of our favorite hot air balloon links are:

Blastvalve (a ballooning search engine and directory)

Hot Air Ballooning

Hot Air Balloons USA

Orlando Balloon Ride

Albequerque Balloon Fiesta

Ballooning International

If you find any more which are worthy of adding to the list, please let us know at <urieli@bobcat.ent.ohiou.edu>