One of my favorite yodelers is at

http://www.kerrychristensen.com/

I've never seen him live, but I've listened to his recordings and enjoyed them. His yodeling is great and his 'normal' voice is very fine.

I feel that a yodeler should be worth listening to between the yodels.

Best of all, Kerry sells instructional stuff on how to yodel. He admits that most of the CD's are purchased by grandparents who give them to their grandchildren to get revenge on their own kids.