Have you ever gone to Yahoo's Video sharing site? They have some great Betta Videos there as well.
Go here http://video.yahoo.com/ to check it out. Just search "Betta Fish" and you'll be given a list of betta videos that people have shared. Some are fantastic. Others....well, you be the judge =)
I wanted to share some with you here, but it seems Yahoo wont let me post the videos directly on my blog.
So if you have some time go take a look.