I was surfing for information on Begonias when I found this site with instructional videos. The site is called Graspr and a link was added in the Online tools section.
Found one on how to grow tuberous begonias by the head gardener at White Flower Farm. The video is now embedded in the Begonia category of the weblinks. More links will be added.
Begonias: Cultivation, Identification, and Natural History